`` Three or four members of al Qaeda in the Arabian Peninsula , '' took part , one source says . Another source briefed on the investigation had previously told CNN that Belmoktar had received a call in the aftermath of the Benghazi attack from someone in or close to the city . Western intelligence services suspect they may have been sent to carry out the attack . The group is believed to be based in Yemen and has ties with Al Qaeda's Yemeni affiliate.
`` Three or four members of al Qaeda in the Arabian Peninsula , '' took part , one source says . Western intelligence services suspect they may have been sent to carry out the attack . The group is believed to be based in Yemen and has ties with Al Qaeda's Yemeni affiliate.