MANILA, Philippines (AP) — 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 “protective custody” on Monday, when he reappeared after months of absence.Several senators were still in the building after holding a session when the gunshots were heard by a throng of journalists, including two from The Associated Press. Armed security personnel, including military members, ran around with guns ready and later asked employees to leave as tensions started to ease.

Senate President Alan Cayetano briefly appeared before journalists in the Senate shortly after the shots were fired but could not provide details.