OAKLAND -- Four people were shot -- one during an attempted robbery -- in different parts of Oakland between Saturday afternoon and early Sunday, police said.

All of the victims are expected to recover and none of the shootings appear to be related, police said.

The attempted robbery and shooting happened about 1:32 a.m. Sunday in the 2400 block of Eighth Avenue in East Oakland.

Police said a 21-year-old man was confronted by two people near his home who ordered him at gunpoint to give them his wallet. But before he could, he was shot in the arm by the suspects who fled in a car without taking anything from him.

Police are still not sure why the man was shot. He was taken to a hospital where he was in stable condition.

At 10:50 p.m. Saturday, a 23-year-old man was confronted by a group of other men while he walked in the 500 block of 12th Street in downtown.

When he tried to run away, he heard gunfire and was hit in the foot and leg. He was taken to a hospital and is in stable condition.

Police don't know why the man was shot and no arrests have been made.

About 2:13 p.m. Saturday, a man and woman were wounded by gunfire in the 1200 block of Eighth Street in West Oakland during a shootout between two groups, police said.

The 29-year-old woman was wounded in the stomach and the 30-year-old man in the leg. They were taken to a hospital and were in stable condition. Their relationship was not known.

Police believe the two, who live in the area, were innocent victims of what may have been a gang-related shooting. No arrests have been made.

Police and Crime Stoppers of Oakland are offering up to $5,000 in reward money in each shooting for information leading to the arrest of the suspects. Those with information may call police at 510-238-3326 or 510-238-3426 or Crime Stoppers at 510-777-8572.

Contact Harry Harris at hharris@bayareanewsgroup.com.