Description:Syrian rebels fighters witness what they say is an airstrike on a military base in Idlib province. The video, which cannot be verified by Reuters, appears to show Taftanaz airbase under heavy fire. A second video from the same area is said to show a bomb falling from a military helicopter on Wednesday (January 9). It breaks up before hitting the ground. A voice behind the camera says it's a cluster bomb - being dropped to fight a rebel siege.(1:20)