OAKLAND, Calif. — The widow of the gunman who attacked a gay nightclub in Orlando, Fla., in June, leaving 49 patrons dead, knew about the attack before it was going to happen and failed to do anything to stop it, a federal prosecutor said Tuesday.

Noor Salman barely spoke at her first appearance in court in Oakland to face charges of aiding terrorism and lying to investigators following an indictment by a grand jury in central Florida.

Her arraignment was delayed another day so that one of her attorneys could arrive. Salman was arrested Monday.