WASHINGTON (AP) - U.S. counterterrorism officials are concerned about potential attacks from al-Qaida's Yemen offshoot, though they say there is no credible information pointing to an imminent strike. Officials say an increase in intelligence chatter over the past six months and the resurfacing of the group's top bomb maker are among the reasons the counterterrorism community is worried. The group, known as al-Qaida in the Arabian Peninsula, has been a major threat since 2009, when one of its adherents tried to bring down a Detroit-bound airliner on Christmas Day. The Saudi Arabian man who made the bomb, Ibrahim Hassan al-Asiri, went underground after the U.S. killed one of the group's leaders last year. But officials say al-Asiri has resurfaced and could be working on building more bombs to use against the U.S.