Border Patrol Chief Gregory Bovino is accused of hurling a tear gas canister during demonstrations against a sweeping immigration crackdown in Chicago, an act that allegedly violated a court order.

According to the complaint filed by group of protesters, journalists and clergy members against the Department of Homeland Security (DHS) on Thursday, Bovino “apparently threw tear gas into a crowd without justification” in Chicago’s Little Village neighborhood, breaking a standing order from U.S. District Judge Sara Ellis.

That order bars federal agents from using tear gas and other chemical agents on demonstrators unless they first deliver two warnings. It allows limited exceptions, when giving warnings isn’t practical or when a person presents an immediate danger to officers or bystanders.

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