NEW : Drone strikes targeted a truck carrying 11 suspected militants , officials say . In the middle of the clip , the man known as al Qaeda 's crown prince , Nasir al-Wuhayshi , appears out in the open , greeting followers in Yemen . Yemen : One of the strikes inadvertently hit a civilian pickup truck , a source says . Most of those killed were al Qaeda militants , Yemeni officials say .
NEW : Drone strikes targeted a truck carrying 11 suspected militants , officials say . Yemen : One of the strikes inadvertently hit a civilian pickup truck , a source says . Most of those killed were al Qaeda militants , Yemeni officials say .