The latest on US air strike in Somalia

U.S. military forces attacked the extremist al-Shabab network in Somalia Monday, the Pentagon said, and a witness described ground-shaking explosions in a strike that reportedly targeted the group's leader.

Al-Shabab had attacked the upscale Westgate Mall in Nairobi, Kenya, killing at least 67 people a year ago this month and the U.S. had targeted planners of the bloody assault.

There was no immediate comment from al-Shabab and U.S. commanders were waiting to determine the attack's outcome. A member of the Somali Islamic extremist group al-Shabab says its leader was traveling in one of two vehicles that were hit last night in a U.S. military strike. But the spokesman would not say if the leader was among the six militants who were killed. The group is the one that attacked an upscale mall in Nairobi, Kenya, a year ago, killing at least 67 people.