OAKLAND -- Two people died Friday night and early Saturday in separate shootings in Oakland, and three others were wounded, police said.

A 21-year-old Pittsburg woman who was downtown at a bus stop at 1:30 a.m. Saturday was killed when a man who had a been arguing with a couple a few minutes earlier fired shots at them and others, police said.

The slain woman was not involved in the confrontation in the 1300 block of Broadway; police said she was an innocent bystander.

She was hit, fell to the ground and was taken by ambulance to Highland Hospital, where she later died, police said. Her name was not released.

The couple, a 20-year-old Oakland woman and her 21-year-old boyfriend, who is from San Leandro, were both wounded and taken to a hospital. They are expected to recover, police said.

Police said they did not know what sparked the argument. The couple had been at the First Friday outdoor street party earlier in the evening and then went to some bars and clubs in downtown, police said. It was not known what the slain woman had been doing in downtown.

No arrests had been made Saturday.

In an unrelated attack at 8:24 p.m. Friday, two 19-year-old men were shot in the 2900 block of 106th Avenue, a few blocks from the San Leandro border, police said.

One man died there and the other was in stable condition Saturday at a hospital and expected to recover, authorities said.

Their names were not released. No motive was given for the shooting and no arrests had been made Saturday.

Police and Crime Stoppers of Oakland are offering up to a $20,000 reward in the Broadway shooting and up to $15,000 in the East Oakland shooting for information leading to the arrests of the gunmen.

Anyone with information should call police at 510-238-3821 or a tip line at 510-773-2805.

Contact Harry Harris at hharris@bayareanewsgroup.com. Contact Kristin J. Bender at kbender@bayareanewsgroup.com.