By JOSEPH GEHA 

OAKLAND — A mass shooting Saturday evening that killed one young man and tore up a massive Juneteenth celebration around Lake Merritt was carried out by “multiple shooters,” and likely is connected to gangs based in San Francisco, authorities said Monday.

“The individuals responsible were multiple shooters, not just one. We’ve learned over the last couple days that several people fired weapons during this event,” Oakland Police Chief LeRonne Armstrong said during a news conference. Authorities added another victim to the total Monday, saying seven people had been injured in addition to the one person killed.

“We don’t believe that this was a random shooting. We believe that this was directly related to group and gang violence … related to the city of San Francisco,” Armstrong said.

Police have not yet definitively identified the people responsible for the shooting, which took place around 6:22 p.m. in the 2200 block of Lakeshore Avenue. Authorities are working with San Francisco police’s gang units to investigate the case, police officials said.

“There seems to be some group or gang feud going on, and it appears they may have met or encountered each other during the festivities at the lake,” Oakland Lt. Leo Sanchez said.

“We have no evidence yet … that there’s any Oakland gang ties involved in this, in the actual shooting,” Sanchez said.

Two men who were seen running from the area with guns were arrested on the night of the shooting, but police said Monday they do not appear to be associated with the shooting.

The man who was killed was a 22-year-old resident of San Francisco, Armstrong said, though police did not identify him.

Police officials, however, said it appears some of those wounded were not intended targets of the violence.

“There were individuals also that were just part of the festivities, part of the gathering, and were caught up in the crossfire,” Sanchez said.

Police said those wounded range in age from as 16 to their mid-60s, and several of them were hospitalized in stable condition as of Monday.