CNN  —  An American citizen from Oklahoma was among eight men, all family members, rounded up and killed in an execution-style attack during the sectarian violence that flared in Syria last week. Hosam Saraya, a 35-year-old Syrian-American, was identified by friend Bahaa Imad and a US relative as one of eight men whose killing was captured on a video that circulated on social media over the weekend. The video, which has been geolocated by CNN, shows a group of armed men wearing military