Story highlights Michael Brelo and twin brother Mark are each accused of assault

Why they fought each other isn't disclosed in police report

They voluntarily surrender to police

(CNN) Cleveland police Officer Michael Brelo allegedly engaged in a fight with his twin brother during a night of drinking just four days after Brelo's acquittal in a black couple's killing, authorities said.

Michael Brelo and his brother, Mark, each facing assault charges, voluntarily surrendered Wednesday, police said.

Michael Brelo, 31, was released on his own recognizance, and his arraignment was scheduled for June 10, authorities said.

Mark Brelo of Brunswick, Ohio, also was released, police said.

The Brelo brothers and their attorneys couldn't be immediately reached for comment.

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