part of those strikes overnight hit a political headquarters for another organization known as ahrar al sham. they are syrian rebels not linked to al qaeda, not allied to al qaeda and not prescribed as a terror group by the united states. their building was certainly hit according to monitors and activists and witnesses on the ground. that may be because the u.s. was trying to get some horazan members inside at the time. there are a lot of quite confused and angry syrians who consider the u.s. targeting, nusra, an al qaeda affiliate, but have popularity among syrians because they fight febtively against the syrians in the war, now they're targeting ahrar al sham, two groups to protect from the syrian regime. that's raising confusion, bewilderment about the u.s. intentions in the strikes they're making on nonisis targets like nusra and contributing to a sense of malaise about where the u.s. bombing campaign is going in syria. >> as you know it gets complicated, this war that's going on in syria, nick, nusra is considered an al qaeda split off by the u.s. government, the state department regar

airstrikes have reportedly hit a compound belonging to the islamist rebel group ahrar al-sham. one of the top groups fighting certain president bashar al-assad. the strikes came as the u.s. targeted the al-qaeda-linked nusra front. on thursday, ahrar al-sham said the strikes destroyed one of its bases and killed civilians including children. an unnamed pentagon official told the wall street journal the group was not targeted intentionally. speaking thursday, chair of the joint chiefs of staff martin dempsey compared the fight against the islamic state in syria to a rubik's cube. cook's north of aleppo right now rubik'st -- it is a cube. every time you touch it, a changes in your something new to consider. trueis a case of staying to the principal that we will over timdefeat isil. >> a new probe finds the pentagon has failed to act on claims by more than 600 u.s. servicemembers who have reported being exposed to chemical weapons in iraq since 2003. the numbers came to light through an internal pentagon review after a new york times report last month found the bush administration

but al nusra headquarters, the al qaeda affiliate in syria prescribed as a terror organization but another building hit belonged to ahrar ash shamnd they are not considered a terror organization and they are not allied to al qaeda. there are some syrians scratching their head as to how they came under u.s. cross-hairs and saying that women and children were killed in that blast. anderson? >> from your vantage point, do you believe this is doing damage to u.s. credibility? >> well, certainly there are many syrians who felt attacks against nusra are protecting them in the lengthy civil war against the regime. ahrar ash sham also. remember what jim said about the coordination and the information with iran, the key regime. broadening these attacks to ahrar ash sham because they seemed to be a necessary target at the time. many syrians are wondering what it's been for some time and whether or not they are assisting the syrian regime. >> jim sciutto and nick paton walsh, thank you. let's take a wider look at this with philip mudd. the situation in syria, phil, seems like it's becoming more and more complicated. does it seem that way t