Obama says U.S. to hunt failed plane attack's backers

"We will not rest until we find all who were involved and hold them accountable," Obama said, interrupting his year-end vacation in Hawaii to assure Americans that his administration was doing all it could to ensure security after a Nigerian man managed to smuggle explosives onto a Detroit-bound flight.

"The American people should be assured that we are doing everything in our power to keep you and your family safe and secure during this busy holiday season," he said.

Nigerian Umar Farouk Abdulmutallab, 23, is charged with attempting to blow up a Northwest Airlines plane as it approached Detroit on a flight from Amsterdam with almost 300 people on board.

Abdulmutallab has told U.S. investigators that al Qaeda operatives in Yemen supplied him with an explosive device for the attempted December 25 attack and trained him on how to detonate it, officials said.