The sound of gunshots, apparently from inside the chamber, was broadcast on live television as a senator in the Philippines, who was an ally of the former leader Rodrigo Duterte, faced arrest.

Video shows Senator Ronald dela Rosa, who is wanted by the International Criminal Court over Rodrigo Duterte’s drug war, dashing into the Philippine Senate.

But the prosecution of Ms. Duterte, who has become the archrival to President Ferdinand R. Marcos Jr., is likely to fail again in the Senate.