by Steve Rubenstein

A night of gun violence erupted in Oakland on Friday and Saturday, leaving eight people wounded in five separate shootings, police said.

Three men and a woman, all unidentified, were shot around 3:22 a.m. Saturday at 1400 Lakeshore Ave., near Lake Merritt. The woman was listed in critical condition and the three men were in stable condition, said Oakland police Officer Johnna Watson, a department spokeswoman.

Fifteen minutes earlier, police found a man with a gunshot wound at 17th Street and Broadway.

Earlier Saturday morning, two men were struck by gunfire — one at 2600 East 27th Street and the other at Howell and 58th streeets, Watson said.

At 8:48 p.m. on Friday, police located a man with a gunshot wound in the 1400 block of 89th Avenue. Watson said he was listed in critical condition.

Police haven’t released the names of any of the victims.

The department was offering rewards of up to $20,000 for information leading to arrests, Watson said.

The five overnight shootings followed two deadly shootings in the predawn hours of Friday morning. One occurred at 55th Avenue and Foothill Boulevard and the other occurred in the 1400 block of 3rd Street. Both victims were men who were not immediately identified.

No arrests have been made in any of the shootings.

The violence came as Oakland Mayor Libby Schaaf released a highly anticipated budget proposal on Friday. The mayor’s two-year budget totals $3.85 billion and includes more than $690 million for the Police Department through 2023. The amount represents a slight increase over previous years, mostly to account for overtime expenses.

Police reform activists criticized the proposed police spending a year after George Floyd’s murder prompted many city leaders to say they would cut the amount they spend on policing in favor of spending more on social services.

Cat Brooks, co-founder of the Anti Police-Terror Project, issued a statement calling the proposed police spending “completely antithetical to what the people are demanding.”

Steve Rubenstein is a San Francisco Chronicle staff writer. Email: srubenstein@sfchronicle.com; Twitter: @SteveRubeSF