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The sun was just setting on Memorial Day when gunshots ripped across St. Andrew’s Playground on Atlantic Avenue in Bedford-Stuyvesant.

Three teenagers were wounded in the gunfire, the youngest being 16. It was one of six shootings during the holiday weekend that left 10 wounded and one dead in northern Brooklyn, where police have been wrestling to contain a steep rise in murders and shootings.

Over all, murders and shootings have dropped in New York City to levels not seen since the 1950s. Murders so far this year are down 11 percent over the same period last year. But the spike in shootings in North Brooklyn over the first three months of the year, peaking at 22 in March, shows that the police have struggled to contain pockets of violence, often driven by gangs.

Monday night’s shooting in Bedford-Stuyvesant appears to be part of a wave of tit-for-tat violence in the 79th Precinct between several street gangs, the police said, among them Brisp Nation, Gates Fam, Rich Fam, the Hoolies and the 900 gang.