SAN DIEGO (AP) — A homeless man was arrested on suspicion of using a hammer to brutally kill another man near a San Diego bus stop.

The San Diego Union-Tribune reports police say detectives believe an argument between the two men preceded the public attack Monday near a bus stop in the Midway District.

Investigators were working to determine what the dispute was about and whether the two men knew each other.

Witnesses called 911 about 6:15 p.m. and reported that a man was using a hammer to strike the victim. Holden said the assailant bashed the man in the head with the hammer, knocking him to the ground, then continued to strike him in the head and face while the victim lay in the street.

Witnesses started CPR on the victim until officers and medics arrived, the but man died despite the efforts.

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Information from: The San Diego Union-Tribune, http://www.utsandiego.com