Bay Area residents experienced a violent weekend that resulted in the death of seven people in four different cities, authorities said.

Oakland, San Francisco, Sunnyvale, and San Mateo homicide investigators were looking into the crimes. The latest incident occurred at a small park near East 26th Street and Highland Avenue in Oakland on Sunday.

Violent Weekend

Two 17-year-old boys were the victims of the latest incident. One was pronounced dead at the scene while the other died after being transported to Highland Hospital. Police immediately detained a man in connection with the case.

“Everything begins at home and ends at home so we have to take responsibility for our children as well. We all have to participate when it comes to public safety and that’s really sad what’s going on right now,” Oakland City Councilmember Noel Gallo said, urging police and community members to work together to reduce violence.

San Francisco police also arrested a 17-year-old boy in connection with a shooting incident at Persia Avenue and Vienna Street in the Excelsior District on Friday night. Authorities identified the victim as 31-year-old Jose Vergara-Lopez.

On Saturday afternoon, a suspect fatally shot 54-year-old Randy Armstrong and a second man a few hours later in the Potrero Hill housing complex. Sunnyvale police said a man was fatally shot on Tasman Drive near North Fair Oaks on Saturday morning, marking the city’s third homicide this year.

Authorities arrested 32-year-old Natig Manashirov for alleged murder but has not been reported with a motive yet as investigations are still ongoing.

A San Mateo resident, 19-year-old Ashly Tianson, died after being shot while sitting in the driver’s seat of a parked car at the San Mateo Adult School on Friday night. Police arrested two 16-year-old boys on an unrelated matter, KTVU reported.

“This incident is in no way associated related or connected to the San Mateo Adult School. The individuals involved were familiar with each other,” San Mateo police spokeswoman Officer Alison Gilmore said.