WASHINGTON, D.C. - Attorney General Eric Holder says the FBI has opened an investigation into the deaths of the four people killed in the attack on the U.S. consulate in Benghazi.

The attorney general made the comments in remarks prepared for delivery Thursday in Doha, Qatar. The attorney general is in the region this week for meetings with his foreign counterparts.

In Doha, the attorney general said the U.S. is committed to working with the Libyan government to seek justice for the deaths of Ambassador Chris Stevens and three other Americans at the consulate.

On Wednesday, a law enforcement official said the FBI was sending evidence teams to Libya.

Secretary of State Hillary Rodham Clinton criticized the video that provoked the protests in the Arab world, including Libya.

Clinton says the film is "disgusting and reprehensible." She calls it a cynical attempt to offend people for their religious beliefs.

But Clinton says the U.S. would never stop Americans from expressing their views, no matter how distasteful. And she says the film is no justification for violence or attacks on U.S. diplomatic facilities and personnel.

Clinton said Thursday the U.S. is monitoring protests in Yemen and elsewhere. She's urging countries to take steps to prevent protests escalating into violence.