Shots rang out in the Philippine Senate Wednesday as chaos unfolded after a man wanted by the International Criminal Court staked out an office in the Senate as his hiding place and called on his supporters to block his arrest.

The ICC had unsealed a warrant Monday for the arrest of Senator Ronald dela Rosa, a former police chief in his sixties who formed the bulwark of the enforcement of ex-President Rodrigo Duterte’s bloody crackdown on illegal drugs. Both men are accused of crimes against humanity, and Duterte is already awaiting trial at the ICC for that charge. Dela Rosa has denied any involvement in illegal killings during Duterte’s administration.

No casualties have been reported, and President ‌Ferdinand Marcos Jr. urged calm while assuring the public that the government was not involved and would get to the bottom of this.

“We will get to the bottom of this,” he said in a recorded video message. “Was this encounter part of destabilization? We will need to know.”

Hours earlier, dela Rosa took to Facebook to appeal for help.

“I am appealing to you, I hope you can help me. Do not allow another Filipino to be brought to The Hague,” he said in a video on Facebook from his Senate office hideout, where he was placed under legislative protection.

Shortly thereafter, more than a dozen shots rang out in the Senate, causing legislators to scramble for cover. The senate secretary accused the justice ministry of sending its agents to infiltrate the Senate, who then fired shots as they retreated, but the ministry denied sending any agents to the Senate.

The Senate was already under heavy guard protection as protesters arrived to call for dela Rosa’s arrest. Dela Rosa appealed to Marcos not to hand him over to the ICC after returning to the Senate Monday for the first time following his disappearance from public view in November. Marcos filed a petition with the Supreme Court requesting it block dela Rosa’s transfer to The Hague. The court gave all parties 72 hours to respond.