The U.S. embassy in Yemen has reopened after a two-day closure, which was prompted by a terrorist threat.
Embassy officials said that successful counterterrorism operations allowed the embassy to resume operations Tuesday.
The embassy shut down Sunday, because of an imminent threat by al Qaeda. The British and French embassies followed suit. The Yemeni government took action Monday, killing at least two al Qaeda terrorists.
Secretary of State Hillary Clinton said the growth of al Qaeda in Yemen is a threat the world must take seriously.
"The instability in Yemen is a threat to regional stability and even global stability," Clinton said. "And we're working with Qatar and others to think of the best way forward to try to deal with the security concerns."
President Obama is scheduled to meet with his top security advisors on Tuesday to discuss how to strengthen the federal watch list system and to prevent terrorist attacks.
Also on Tuesday, the FBI will give the president an update on its investigation into the attempted Christmas Day airline bombing in Detroit. Obama will also hear reports about the airport screening system and the new security measures.
The president will also be briefed by Lee Hamilton, his top counter terrorism advisor, on mistakes by the intelligence community.
"I think clearly the system broke down here," Hamilton said.
People flying to the U.S. from overseas now face enhanced security. Airlines have been told to give full body pat downs to all U.S. in-bound travelers from Yemen, Nigeria, Saudi Arabia as well as all passengers from 11 other countries where the U.S. believes terrorists are active.
The president is expected to share his findings with the public after his meetings Tuesday. In addition to detailing the intelligence failures surrounding the Christmas Day terror attempt to destroy a Detroit-bound U.S. airliner, Obama will also outline new steps to prevent terrorist attacks.