CHEVERLY, Md. (AP) — The Latest on the fatal shooting of an officer outside a police station in Maryland (all times local):

12:20 p.m.

Police say evidence shows a gunman who killed an officer outside a police station in a Maryland suburb of the nation's capital "intended to die during a gun battle with police."

Prince George's County police tweeted Monday that they now have a third brother in custody in connection with the death of Officer Jacai Colson on Sunday night. Police have not identified them. All are in custody.

Police Chief Hank Stawinski says the shooter opened fire on the first officer he saw outside the station Sunday afternoon. A gun battle followed, and the gunman was wounded.

"It wasn't about anything," Stawinski said.

4:50 a.m.

___

Police say they're seeking answers for why a gunman opened fire outside a police station in a Maryland suburb of the nation's capital, killing an officer in what the police chief called an "unprovoked attack."

Prince George's county police chief Hank Stawinski says the shooter opened fire on the first officer he saw outside the station around 4:30 p.m. Sunday. A gun battle followed, with several officers shooting at the suspect, who was wounded.

On Sunday night, hours after the shooting, Stawinski had few answers for reporters about what led to the gunfire. He said the shooting suspect and another man were arrested.

"It wasn't about anything," he said of the shooting.