A Phoenix Police sergeant is under internal investigation for his involvement as an armed and masked counter-protester during a student led anti-ICE protest in Chandler, according to records.

That man was confirmed to be Phoenix PD Sergeant Dusten Mullen. When an officer approached him, he was arguing with students, telling them to “grow up and act like adults.”

FOX 10 Investigator Justin Lum obtained the Chandler Police report detailing how the off-duty officer allegedly wanted students to assault him.