No suspects identified in 2 weekend slayings in S.F.

A victim was stabbed and killed early Saturday morning at Civic Center Plaza. Police said the victim, who was not immediately identified, was stabbed in the back with an unknown weapon near Fulton and Larkin streets. less A victim was stabbed and killed early Saturday morning at Civic Center Plaza. Police said the victim, who was not immediately identified, was stabbed in the back with an unknown weapon near Fulton and Larkin ... more Photo: Judith Calson / Special To The Chronicle Photo: Judith Calson / Special To The Chronicle Image 1 of / 3 Caption Close No suspects identified in 2 weekend slayings in S.F. 1 / 3 Back to Gallery

Police are working to track down the people responsible for two separate slayings over the weekend in San Francisco, authorities said Monday.

The first killing happened around 5:50 a.m. Saturday in Civic Center Plaza. Police said the man, who was not immediately identified, was stabbed in the back with an unknown weapon near Fulton and Larkin streets.

The victim was rushed to San Francisco General Hospital, where he was pronounced dead, police said.

Then on Sunday, authorities found the body of a man who had been shot and killed in John McLaren Park.

The victim, who was not immediately identified, was found dead in the park at 6:30 a.m. Sunday, police said.

Authorities have not identified a suspect in either killing.

Evan Sernoffsky is a San Francisco Chronicle staff writer. E-mail: esernoffsky@sfchronicle.com Twitter: @EvanSernoffsky