1 of 2 | Philippine Senator Ronald dela Rosa, right, a former national police chief under former President Rodrigo Duterte, attends a session at the Senate in Pasay City, Manila, Philippines, Wednesday. Dela Rosa is on his third day within the Senate premises and has asked Philippine President Ferdinand Marcos Jr. to not allow the execution of a warrant issued by the International Criminal Court for his arrest. Photo by Rolex Dela Pena/EPA

May 13 (UPI) -- Gunshots were heard in the Philippines Senate on Wednesday, where a senator is hiding from authorities with an arrest warrant for alleged crimes against humanity.

It's not clear who fired the shots, and no casualties have been reported, senators told reporters on Wednesday, CNN reported.

"I don't know what is happening. I do not know if I can keep my people safe here," Senate President Alan Peter Cayetano said in a Facebook livestream from inside the Senate complex after the gunshots. "I'm willing to go out. I'm willing to face anyone who is going to serve the warrant ... but do not do this."

Sen. Ronald dela Rosa, 64, is accused of the crimes by the International Criminal Court for his role in overseeing former President Rodrigo Duterte's "war on drugs." He has spent two nights in the Senate building in a standoff.