New Delhi, May 14 -- A burst of gunfire rang out late Wednesday in the Philippine Senate, sparking chaos in the building where authorities had tried to arrest a senator wanted by the International Criminal Court in connection with a deadly government crackdown on drugs.

No one was hurt, officials said. President Ferdinand Marcos Jr. asked the public to stay calm in televised remarks.

It was not immediately clear who fired the shots or why. The gunfire erupted as Philippine authorities tried to arrest Sen. Ronald dela Rosa, a former national police chief who enforced former President Rodrigo Duterte's anti-drug efforts in which thousands of mostly petty suspects were killed from 2016 to 2018.

Allied senators took dela Rosa into "protect...