. >> reporter: as roche's president arrives -- iran's president arrives in new york for the assembly meeting, there are fears he could be planning bargaining tools. he has suggested the two could be traded for those in u.s. custody. sarah shourd was released and spoke out about the release of her two friends. their moms are in new york. >> we are mothers, we are not politicians. we're just very, very eager to have our children returned to us. the united states and iran do not have direct diplomatic relations but secretary of state hillary clinton is also in new york for the u.n. summit and she's calling on mahmoud ahmadinejad to "make a very significant humanitarian gesture and release the two americans." reporting live from washington, d.c., alison burns, ktvu channel 2 news. >>> security, poverty and world hunger are all on the agenda at the united nations world assembly. 150 heads of state are taking a look at goals set a decade ago. mahmoud ahmadinejad will address the assembly on thursday. yesterday, he cammed the united states to accept his country as a powerhouse. he also says