San Francisco police redoubled enforcement efforts in the Mission District on Monday after a pair of shootings on the same street over the weekend left three men dead, including a Norteño gang member who had been repeatedly cited for violating the city's gang injunction.

The fatal shooting of the Norteño member Friday night on 24th Street prompted what police believe was a retaliatory attack Sunday afternoon in a pizza parlor eight blocks away in which two men were killed.

"The whole thing has been gang-related violence," said police Capt. Steve Tacchini, commander of the Mission Station. "We've increased the presence there - it's kind of a hot spot already. As the warm weather approaches, we see a greater likelihood of confrontations on the street, more consumption of alcohol."

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