Updated at 12:00 p.m. ET: Russia rebuffed President Barack Obama's threat of unilateral action against Syria Tuesday, as officials said 2,500 refugees fled across the border into Turkey in just 24 hours – one of the highest daily refugee flows of recent weeks.

Russian Foreign Minister Sergei Lavrov, speaking after meeting China's top diplomat, said Moscow and Beijing were committed to "the need to strictly adhere to the norms of international law ... and not to allow their violation".

Obama draws 'red line' for Syria on chemical and biological weapons

Obama on Monday threatened "enormous consequences" if his Syrian counterpart used chemical or biological arms or even moved them in a menacing way.

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The president used some of his strongest language yet to warn Assad not to use chemical or biological weapons – after Syria acknowledged for the first time that it had such weapons and could use them if foreign countries attacked it.

"We have been very clear to the Assad regime, but also to other players on the ground, that a red line for us is (if) we start seeing a whole bunch of chemical weapons moving around or being utilized," he said. "That would change my calculus."

Syria 'ready to discuss' Assad's resignation, deputy PM says

"We cannot have a situation where chemical or biological weapons are falling into the hands of the wrong people," Obama said, perhaps referring to Lebanon's Shiite Hezbollah group, an Iranian-backed ally of Assad, or to Islamist militants.

Turkey's foreign minister has warned it can accommodate no more than 100,000 refugees and that the United Nations may need to create a "safe zone" within Syria to shelter any beyond that number.

Thousands of refugees
A Turkish official told Reuters on Tuesday that about 2,500 people fleeing violence in Syria had entered Turkey in the preceding 24 hours, most of them entering the southeastern Turkish province of Hatay.

Turkish journalist Mahir Zeynalov reported on Twitter that four Syrian colonels and two captains crossed the border early Wednesday.

PhotoBlog: Clashes over Syrian conflict in Lebanon leave ten dead

Turkey is now sheltering close to 70,000 Syrian refugees and is struggling to accommodate the influx, which rose after a bomb attack near the border killed eight, spreading panic.

In Lebanon, street battles between Sunnis and Alawites continued for a second night running, fueled by conflicting loyalties in the conflict across the border. The BBC reported that seven were killed and more than 70 wounded in the country's second-largest city, Tripoli.

Syrian President Bashar Assad, an Alawite, is battling largely Sunni opposition fighters. Lebanese Prime Minister Najib Mikati, himself a Sunni, appealed to both sides to end the "absurd battle" in Tripoli.

In Syria itself, the army deployed tanks on a ring road surrounding Damascus on Wednesday and shelled southern neighborhoods where rebels operate, in the heaviest bombardment on the capital since the army reasserted control last month, residents said.

At least eight people were killed in the shelling, which was accompanied by an aerial bombardment, on the Kfar Souseh, Daraya, Qadam and Nahr Aisheh neighborhoods, they told Reuters.

Regional news channel Al-Jazeera reported that at least 24 people were killed across the country on Tuesday, among them women and children in Aleppo - the city over which the rebel Free Syrian Army (FSA) claims two-thirds control, and where a Japanese journalist was killed on Monday.

Activists: Japanese journalist killed in Aleppo

"We now control more than 60 per cent of the city of Aleppo, and each day we take control of new districts," said Abdel Jabbar al-Okaidi, a colonel with the FSA. He went on to list some 30 districts which he claimed were under FSA control, including about half of the embattled neighborhood of Salaheddin.

But a security source in Damascus rejected the claims, according to the AFP news agency, calling them "completely false".

Likened to Iraq invasion
Syrian soldiers killed a journalist sympathetic to the rebels during a raid in Damascus on Wednesday. Mosaab al-Odaallah, who worked for the state-run Tishreen newspaper, was shot at point-blank range at his home by troops conducting house-to-house raids in the southern Nahr Eisha district of the capital, opposition activists said.

Massoud Akko, head of the public freedoms committee at the underground Syrian Journalists Association, said Odaallah's death brought to 54 the number of Syrian journalists, bloggers and writers killed by security forces during the uprising.

"Most have been killed with shots to the head. The regime appears to have adopted a systematic policy of killing journalists and social media activists," Akko told Reuters by telephone from Berlin.

Earlier, Syria's deputy Prime Minister Qadri Jamil said Obama's talk of action against Syria was media fodder.

Speaking after the news conference held by Russia's Lavrov, Jamil said the West was seeking an excuse to intervene, likening the focus on Syria's chemical weapons with the run-up to the 2003 invasion of Iraq by U.S.-led forces and the focus on what proved to be groundless suspicions that Saddam Hussein was concealing weapons of mass destruction.

"Direct military intervention in Syria is impossible because whoever thinks about it ... is heading towards a confrontation wider than Syria's borders," he told a news conference in Damascus.

Meanwhile, the Los Angeles Times reported the concerns of Christians, who make up about 10 per cent of Syria's population. It said Christians fleeing the fighting have detected an increasingly radicalized Islamist strain among the rebels that makes them fear for their future.

Reuters contributed to this report.

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A group of U.S. seed, chemical and equipment companies will invest at least $150 million over the next few years into African agricultural projects and products, the companies said on Friday. 

The investments pledged by DuPont, Monsanto, Cargill and others are part of an overall $3 billion effort by companies around the world announced by President Barack Obama.

Along with companies from India, Israel, Switzerland, Norway and the United Kingdom, and 20 companies from Africa, the corporations have committed some $3 billion for projects to help farmers in the developing world build local markets and improve productivity.

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The United Nations has said that by 2030, the world will need at least 50 percent more food, 45 percent more energy and 30 percent more water. Absent these resources, it said, up to 3 billion people would probably be condemned into poverty.

Capitalizing on food demand in Africa also holds strong profit potential, corporate leaders said.

"It has been a bit chaotic. There are all sorts of issues around the countries in Africa. But the population, the economic growth, the quality of many of the soils is there," DuPont Executive Vice President Jim Borel told Reuters in an interview. "The need is there, the potential is there."

"We're convinced we can take the base we have now, and accelerate that progress," said Borel, who oversees DuPont's food and nutrition businesses. Among DuPont's units is its Pioneer Hi-Bred International seed company, which has operated in Africa for decades.

India and China are more stable and growing faster, but Africa is "not far behind," according to Borel.

The push by global corporations to spend more money and develop new markets across Africa comes as an expanding world population and growing demand for quality food threaten to exceed existing limits of agricultural production.

Investors have been buying up farmland in Africa, hoping to make it more productive using modern agricultural technologies. That, combined with the rising interest of international agricultural corporations, has brought criticism.

Advocates for African farmers fear they will lose control over their food supply and markets. They say African farmers are being displaced and unsustainable farm practices are being introduced.

"The problem is all this is based on large-scale commercial agriculture," said Anuradha Mittal, executive director of the Oakland Institute, a policy think tank. "Who does it benefit? All of these things are supporting the formation of large-scale commercial agriculture, which will hurt small farmers. They could spend far less but focus on providing credit facilities, ensuring open markets and ensuring the rights of small holder farmers." 

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A woman identifying herself as the Colombian prostitute at the center of a scandal involving U.S. Secret Service agents spoke publicly about the incident for the first time on Friday, telling a Colombian radio network that, had she been a terrorist, she could have easily pried loose details of President Barack Obama’s planned visit to Cartagena from the liquored-up agents. 

“At that moment, if I had wanted to, or if I had been part of one of those terrorist groups, it's obvious I would have been able to get everything," the woman, Dania Londono Suarez, told Caracol Radio. 

Suarez said the Secret Service personnel did not consume drugs, but “bought alcohol like one buys water” while partying at a discotheque in the tourist destination before inviting some of the “escorts” to return with them to the Hotel Caribe, where many members of Obama’s security detail were staying.

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Suarez said she didn't know if there were other girls or how many agents were involved. "I was at the bar with another girl, but left with him by myself. I was the only one." 

 

 

Suarez said she made clear that she expected to be paid before departing with the agent whose refusal to pay her led to exposure of the misconduct. 

“I was at a disco and he came over and told me 'sex,'" she said. "... I said, 'Baby, Cash, Money,' that I wanted money. He said, 'OK, baby. How much?' 'Eight hundred.' He told me, 'Eight hundred. OK, let's go. Come, come to hotel.'

"It was obvious. I can't believe he would be so dumb or so stupid to think I wasn't going to charge him money."

But she said that the agent had a change of heart when they awoke in his room about 6 a.m.

Watch the most-viewed videos on msnbc.com 

“When he was drunk he was the nicest guy, but when he woke up sober, he was another person,” Suarez said. “When I asked him for the money, he told me ‘Let go, bitch.’ He pushed me into the hallway and closed the door. He wouldn't come out. I kept pounding on the door. Hotel security came.  The called the head of the hotel's security and I explained what happened to him on the phone.” 

Suarez, who has a 9-year-old son, said she traveled to Dubai after the incident but had returned to Colombia despite concern that she could face retaliation from the tarnished Secret Service personnel. 

"I fear they will retaliate against me," she said. "I left my country, practically fled. Yes I am scared. I fear or my family and for my son. No one has threatened me, no one has come to see me, but their marriages have been wrecked, they're sharp shooters, because I've been doing some research and I know they do that."

She also said her career as an escort is over: "I do not plan to that ever again," she said. "They ruined my life. They should have never published my pictures, my name." 

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Members of elite unit among those suspended in Colombia

The Secret Service has declined to comment on the interview. According to an official with the Secret Service the agency is close to completing its internal investigation of the incident, which occurred prior to the Summit of the Americas on April 14-15. 

The 12 Secret Service personnel at the center of the investigation were among 175 members of the service in Colombia during Obama’s visit. They were among 135 staying at the Hotel Caribe, the source said.

Seven of those members of the agency have resigned, one has been terminated and one has retired, NBC News has reported previously. Three others have been cleared of serious misconduct but given administrative punishment.  

Meantime, a separate investigation into U.S. military personnel who were allegedly involved in the incident has been concluded and forwarded to a commander for review, military and defense officials tell NBC News. 

According to the officials, who spoke on condition of anonymity, the U.S. military investigator looking into the incident zeroed in on a dozen uniformed personnel assigned to the security operation -- seven Army personnel (six Special Forces Green Berets and one White House communications specialist); two Navy bomb detection specialists, two Marine dog handlers and one member of the Air Force whose duties were not specified. 

SOUTHCOM commander Gen. Douglas Frazier will review the report and determine what, if any, punishment should be meted out. Once he formally accepts the findings of the investigation, he has four options: 

• Clear any or all the individuals of any wrongdoing.
• Administrative action (a letter of reprimand, usually a career-ender).
• Non-Judicial punishment (reduction in rank and pay).
• Criminal charges and court martial. 

In the Uniformed Code of Military Justice, consorting with or procuring the services of a prostitute is prohibited and considered a criminal act.

Erika Angulo is an NBC News producer based in Miami; NBC's Chief Pentagon Correspondent Jim Miklaszewski and Kristen Welker of NBC's Washington, D.C., bureau also contributed to this report.

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