Passaic County Prosecutor Camelia M. Valdes said detectives from her Special Victims Unit interviewed the victim and several witnesses after receiving a report of the alleged abuse on May 20.
The victim, who's now 9, told them the abuse occurred several years ago, Valdes said Thursday.
The boy, now 16, was taken into custody on Tuesday and sent to the Essex County Juvenile Detention Center in Newark, she said.
A juvenile complaint accuses him of aggravated sexual assault, sexual assault and child endangerment. Because he's a juvenile, a closed-door hearing will be held in the Family Part of Superior Court in Paterson.
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ALSO SEE: Passaic Man, 66, Charged With Rape
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