WASHINGTON (AP) - President Barack Obama and Vice President Joe Biden are attending the return of the remains of U.S. Ambassador Chris Stevens and three other Americans killed in an attack of the U.S. Consulate in Benghazi, Libya, this week. Obama and Biden were to go to Joint Base Andrews in suburban Maryland for the return ceremony, where they will be joined by secretaries of state and defense Leon Panetta and Hillary Rodham Clinton. . Stevens and the other victims were killed Tuesday during an attack at the U.S. Consulate. U.S. officials are investigating whether the assault was a coordinated terrorist attack that took advantage of protests in the Arab world over an anti-Muslim video.(Copyright 2012 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.)

