BOSTON — A Massachusetts man authorities say fired at least nine shots at a group of unarmed teenagers, killing a 15-year-old boy, has been held without bail.

Juan Carlos Matos Figueroa pleaded not guilty Monday to charges including murder in the shooting in Chelsea in January 2017 that killed high school freshman Jimmy Vasquez.

Prosecutors say the 21-year-old Figueroa was armed with a 9 mm handgun with a 30-round magazine and a laser sight. Another teen was struck in the foot.

Authorities did not disclose a possible motive, but Suffolk District Attorney Daniel Conley previously said Vasquez wasn’t involved in gangs, guns, or violence and was “an innocent young man doing what kids his age have always done — hanging out with his friends.”

Figueroa’s lawyer refused to discuss the case outside court.

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