Seven juveniles are facing criminal charges — including assault and battery and kidnapping — stemming from a violent attack on a Quincy pier, state police said.

“An extensive investigation identified the seven assailants as having punched, kicked, and tackled various members of the victims’ group,” state police spokesman David Procopio said today in a statement, “and also with having prevented them from initially leaving the pier so that the aggressors could launch their assault.”

The five victims are between the ages of 14 and 16, Procopio said, and their names and hometowns are not being released because of their ages.

The assailants include a 17-year-old male from Quincy; three 16-year-old males from Quincy; two 15-year-old males from Quincy; and a 14-year-old male from Kingston.

“Each of the assailants is charged with 18 separate counts of offenses including assault and battery with a dangerous weapon, assault and battery, assault, and kidnapping,” the spokesman said. “Each assailant is charged as a principal in certain offenses and as a joint-venturer in other offenses.”

The July 31 incident at Squantum Point Park was recorded on a cellphone and video footage showed several boys being taunted by the group that is now facing charges.

In the video, one of the perpetrators can be seen grabbing a boy standing against a railing and throwing him to the ground while other members of the group jump into the fray and begin punching and kicking the boy as he covered his head with his arms in a desperate attempt to protect himself, Procopio said.

The victims appeared to be trying to leave the pier and walk away from the fight when they were attacked, according to police.

“The assault and battery with a dangerous weapon charges are due to the attackers kicking the victims with shod feet,” Procopio said. “The kidnapping charges stem from the defendants’ refusing to allow the victims to leave the pier. The victims, at that point, were lined up against a railing on the pier. The assault began soon after that.”

The case will be prosecuted by the Norfolk District Attorney’s office and a date will be set for arraignment in Quincy District Court.

Procopio said “the investigation remains open; additional suspects may be identified and additional charges may be determined as the investigation proceeds.”

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