OAKLAND -- Police on Saturday continued to investigate three unrelated killings in East and West Oakland that happened over a six-hour span Friday night.

In two cases, men were shot to death. In the third case, the cause of death will not be known until an autopsy Monday but police are treating the case as a homicide because of trauma to the man's body.

That man was found about 10:57 p.m. Friday inside a motor home in the 2400 block of 24th Avenue in East Oakland.

Police have not released his name but said he was 44 years old, and it appeared he had been dead for several hours. Investigators have no motive for the slaying and no arrests have been made.

Police have not made any arrests in an earlier fatal shooting in West Oakland of an 18-year-old Richmond man. Tommy Lacy III was shot to death about 7:20 p.m. Friday in the 1600 block of 11th Street.

Officer Brad Baker said Lacy got into an altercation with another person and was shot. He was pronounced dead at the scene. Baker said police do not know why Lacy was in the area and have no motive.

In the first fatality of the night, police arrested a 70-year-old man in East Oakland for shooting his 67-year-old friend after the younger man would not leave his garage where they had been socializing.

The suspect was identified as Davis Bennett, who was arrested on suspicion of murder.

The name of the 67-year-old victim, an Oakland resident, was not released pending

Bennett and his friend had been drinking and watching television in Bennett's garage in the 1000 block of 102nd Avenue for about an hour when Bennett asked his friend to leave about 6:25 p.m. Friday, officer Jason Andersen said.

When the man refused, the two got into an argument, which ended with Bennett shooting him, Andersen said. Bennett called police to report the shooting and waited for officers to arrive, authorities said. The victim died at about 7 p.m. at a hospital.

The three killings brought Oakland's homicide toll for the year to 59. Last year at this time there were 60 homicides in the city.

Police and Crime Stoppers of Oakland are offering up to $10,000 in reward money for information leading to the arrest of the killers in the 11th Street and 24th Avenue cases. Anyone with information can call police at 510-238-3821 or Crime Stoppers at 510-777-8572 or 510-777-3211.