For months now, the U.S. government has been raising concerns about Iran's nuclear program... and what they have described as support for Iraqi insurgents.

Today... at a news briefing in Iraq... Coalition officials said U.S. defense analysts have seen an increase in sophisticated roadside bombs... and they believe that orders to send components for those bombs came from the top levels of the Iranian government.  How will the U.S. respond... and what impact could this have on the war in Iraq?  NBC's Jane Arraf is in Baghdad... and NBC's John Yang will have reaction from Washington.

Also, NBC's Andrea Mitchell is in New Hampshire covering Senator Hillary Clinton's campaign swing through New Hampshire.  She interviewed Senator Clinton today and asked about the Senator's vote on the Iraq war.

We'll talk to CNBC's John Harwood about the Republican candidates running for President.

From China, NBC's Mark Mullen talks about the growth of fast food restaurants.

NBC's Tom Costello gives us a first look inside the world's biggest plane.

And we've all heard about the decline in young women entering Catholic convents.  But tonight, NBC's Janet Shamlian takes us to one convent that appears to be bucking the trend.

It's all coming up tonight.  We hope you'll join us.