The explanation was the most definitive to date after the bureau's director had earlier suggested the former president might have been hit by shrapnel, igniting a political storm.
Undeterred by arson attacks on rail lines earlier in the day, the Parade of Nations continued beneath a glittering Eiffel Tower, where Celine Dion belted out a love anthem.
The vice president's expressions of concern for Palestinian suffering marked a shift in emphasis from the president's statements as she moved to establish herself as the leader of her party.
Mayor Eric Adams announced that a new scanner would search for guns on the subway. Riders who refuse to be scanned, he said, will not be allowed to enter the system.