WASHINGTON — Attorney General Michael Mukasey collapsed during a speech Thursday night and lost consciousness, a Justice Department official said.

The 67-year-old Mukasey was rushed to George Washington University Hospital, where his condition was not immediately known.

Mukasey was delivering a speech to the Federalist Society at a Washington hotel when “he just started shaking and he collapsed,” said Associate Attorney General Kevin O’Connor. “They’re very concerned.”

Mukasey was 15 to 20 minutes into his speech about the Bush administration’s successes in combatting terrorism when he began slurring his words. He collapsed and lost consciousness, said O’Conner, the department’s No. 3 official.

Mukasey’s was noticeably shaking during his speech before he collapsed shortly before 10:20 p.m. EST. His security detail called 911. Mukasey was on the stage for 10 minutes being attended to by his FBI detail before medics arrived, according to a Justice Department official who was there. Mukasey was still breathing at the time, said the official, who spoke on condition of anonymity because she was not authorized to talk to the media.

A senior law-enforcement said Mukasey appeared to be talking when he was taken away. That official also spoke on condition of anonymity because he was not authorized to discuss the situation.