Syria Rebels Execute Soldiers On Video

A conference to unify the opposition is scheduled for this weekend

A new video appears to show Syrian rebels killing a group of captured soldiers, spraying them with bullets as they lay on the ground. Human rights groups on Friday warned that the gunmen may have committed a war crime.

The video raises concerns over the rebels just ahead of a major conference this weekend in Qatar at which the United States is trying to unify the opposition under a new leadership. Washington and its allies have been hesitant to give stronger support to the rebellion in part because of worries over its multiple divisions and lack of organization.