Prominent Black Lives Matter activist DeRay Mckesson is calling for peace after at least three police officers were shot and killed in Baton Rouge, La., on Sunday.

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“The movement began as a call to end violence,” Mckesson told The New York Times. “That call remains.”

Mckesson was arrested earlier this month in Baton Rouge while protesting the death of Alton Sterling, who was killed by police on July 5.

The East Baton Rouge Parish district attorney dropped the charges on Friday against Mckesson and about 100 other protesters who were arrested.