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DeRay Mckesson, one of the best known voices for the Black Lives Matter movement, and who was arrested at a demonstration in Baton Rouge, La., earlier this month, called for peace in a phone interview after news of the shooting broke on Sunday.

“I’m waiting for more information like everybody else,” he said. “I have more questions than answers”

“The movement began as a call to end violence. That call remains.”

Mr. Mckesson and several others traveled to Baton Rouge to protest the death of Alton Sterling, who was fatally shot by the police on July 5. The authorities arrested more than 100 people in connection with a protest outside the city’s Police Headquarters, charging most of them with obstructing the road. Eight firearms were confiscated and one officer lost several teeth after he was struck by a projectile, the police said.

“My prayers are with the victims of all violence,” Mr. Mckesson said Sunday.