LAHORE, Pakistan (AP) — A top Pakistani official says authorities opened a murder investigation against an anti-government cleric after a police officer was killed in clashes with the cleric’s supporters.

Rana Mashhood, the provincial minister of Punjab, said authorities opened the case against Tahir-ul-Qadri Sunday, based on recordings of him inciting people to violence.

Under the Pakistani legal system, authorities must first register or open a case before they can arrest a person although it doesn’t necessarily mean an arrest would follow.

Qadri is from Pakistan but also spends time in Canada. He has a network of mosques and religious schools across Pakistan.

He returned in June, vowing to lead a revolution to topple the government.

The investigation of Qadri stems from clashes Friday and Saturday during which Qadri’s supporters battled with police.

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