A three-day convening last week designed to provide Black organizers and community activists with a space to heal, mourn, and strategize around the Black Lives Matter movement ended in indignation following an aggressive interaction with a transit authority officer.

Participants of the Movement for Black Lives Convening, held July 24-26 at Cleveland State University in Ohio, encountered police violence after the closing ceremony, when a Cleveland transit officer took a local Black teenager into custody. The officer believed the teenager was “intoxicated to the point where he was unable to care for himself.”

Witnesses said the officer slammed the young man to the ground before moving the teen into a police vehicle.