One day before the tenth anniversary of the Sept. 11 terror attacks, President Obama and the First Lady paid a visit to Arlington National Cemetery.

The pair visited the area reserved for service members killed in the wars in Iraq and Afghanistan, visiting grave sites and talking with people there, according to a White House pool report.

"On the occasion of the tenth anniversary of 9/11, the President believes that it is important for all Americans to honor those who have served since 9/11, to remember those lives we have lost, and to support their families," a White House official said.

The visit came after the president held a morning national security meeting. There, the president told his national security team to "vigorously" pursue all potential threats as the nation, according to a readout of the event provided by the White House.

The meeting came two days after the White House disclosed that it was examining a "specific, credible" threat tied to the anniversary involving potential truck bombs in either New York City or Washington. The administration emphasized Thursday that the threat was unconfirmed, but being probed by intelligence officials.