syria if diplomacy fails in the words of president obama. but if there is noncompliance, the agreement at the moment is that they ll go back to the security council, look at military action potentially, look at sanctions potentially. that would have to be discussed depending on the nature of the noncompliance. but at the moment, the onus is very much on syria to start acting. matthew chance, thank youvag. the leader of al qaeda urges his followers to keep attacking americans in order to damage the u.s. economy. ayman al zawahiri stressed the importance of small-scale attacks like the boston marathon bombing. he says they force the u.s. to spend more money on security and the military. zawahiri released the audio message to mark the anniversary of the september 11th terrorist attacks. a greyhound bus flipped over in ohio overnight. it happened about 4:00 a.m. about 30 miles north of cincinnati. about 52 people were on board, and at least 34 of them were rushed to the hospital with