Dozens rallied at the playground in Bedford-Stuyvesant where 3-year-old Isaiah Rivera was shot in the leg over the weekend.
Stanley Williams and Antonio McCloud are under arrest and charged with attempted murder.
Police are still searching for another suspect, identified as 20-year-old Jashid Chambers.
Authorities say Williams has 11 prior arrests, including weapon and drug possession.
Rivera was caught in the middle of a shootout around 4 p.m. Sunday in the courtyard of the Roosevelt Houses.
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