The feds want an anonymous jury for the case of the first Guantanamo Bay detainee brought to America to face a civilian trial.

In papers filed yesterday in Manhattan federal court, prosecutors said the charges against alleged al Qaeda terrorist Ahmed Ghailani — accused in the 1998 African embassy bombings that killed 224 people — “are as serious as any that have been brought to trial in this courthouse.”

The request also notes that Ghailani, a former bodyguard for Osama bin Laden, was “by his own admission . . . central to furthering al Qaeda’s murderous objectives.”

“If jurors feel that they ‘may be subjected to violence or death at the hands of a defendant or his friends,’ such fears may well influence their ability to be ‘as free and impartial as the Constitution requires,’ ” the papers say.

Under the prosecution proposal, none of the potential panelists will be identified in court by name, and the jurors, once chosen, will eat lunch together and be picked up and dropped off daily at a “neutral site” away from the courthouse.

Ghailani, who faces life in prison if convicted, is set to go on trial Sept. 27.