explosives and combat. he came back last june days after his brother was killed fighting for nusra in syria. the fbi says mohamud said a friend told him to come back home to carry out a terrorist attack. according to the fbi, he talked about killing police and military execution-style. thank you for that. happening now, air strikes by the u.s.-led coalition helping contain an isis advance in the city of ramadi several miles from baghdad. with tens of thousands of people fleeing that battle a senior open official says troops defending ramadi need more reinforcements and weapons. let's bring in ivan watson following the developments for you are. 20 air strikes by the u.s. what is happening now?