Anthony J. Martinez-Tatro, 16, pleaded not guilty Friday to first-degree assault charges.
Mount Vernon police said the July shooting involved two rival gangs.
Two innocent bystanders, a security guard and an elderly shopper, were wounded.
Three alleged gang members, all 19 years old, were also hurt.
Martinez-Tatro is one of three teens allegedly involved in the shooting.
Charges were filed on Monday and Martinez-Tatro’s bail has been set at $1 million.
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