The fatal shooting of a man in San Francisco’s Mission District on Friday night and a double homicide in the same area Sunday afternoon appear to be connected, police Sgt. Lyn Tomioka said today.

The shootings are being investigated as gang-related, and police have a 19-year-old man and 16-year-old boy in custody for the Sunday shooting, according to Tomioka.

Andres Siordia and the juvenile suspect, both San Francisco residents, were detained less than 10 minutes after the shooting, which happened at about 4 p.m. near Papa Potrero’s Pizza at 2700 24th St.

Francisco Cornejo, 26, and Francisco Pena, 41, of San Francisco, died in the shooting, according to the San Francisco medical examiner’s office.

A third man was also shot, but his injuries are not believed to be life-threatening, police said.

Investigators believe the Sunday homicides are connected to the death of 21-year-old Michael Sanchez, who was shot in the area of 24th and Shotwell streets, Tomioka said.
A second victim was injured in that shooting, according to police.

Tomioka said police were not yet releasing the exact connection between the two incidents, but that investigators are still looking at leads and are asking for more witnesses to come forward.

The Police Department has also raised its presence in the area. The three homicides were the first in the Mission District since November 2008, according to Tomioka.

There have been 37 homicides in San Francisco this year, compared to 81 at this time last year, and 82 at this time in 2007.

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