"Oh, no, no!" people in the audience cried out as Mukasey fell. "Oh, my God!"

Mukasey is Bush's third attorney general. The flinty but measured New Yorker has said the job initially discouraged him, and he has scaled back his public appearances in recent weeks.

A former prosecutor who saw Mukasey hours earlier described the attorney general as tired-looking and drawn.

Talamona said that Mukasey's wife, Susan, was with him at the hospital.

After collapsing, Mukasey lay on the stage for about 10 minutes being attended to by his FBI security detail and medical personnel at the dinner, said eyewitness Abigail Thernstrom, a senior fellow at the Manhattan Institute. Though he lost consciousness initially, Mukasey appeared to be awake when he was taken from the Marriott Wardman Park Hotel in northwest Washington, she said.

"It was hard to watch such a thing," Thernstrom said. "It was horrible."

A Republican staffer on the Senate Judiciary Committee, Jack Daly, who was also at the dinner, said in an e-mail to colleagues sent at 10:20 p.m. EST: "AG Mukasey collapsed in the middle of his keynote address at tonight's fed-soc dinner. He is still on stage after ten minutes and his security detail has called 911. The paramedics just arrived."

Twenty minutes later, Daly added in another e-mail: "Mukasey did regain consciousness before he was taken away."