The teenagers allegedly attacked three freshmen students Sunday in a cabin at Camp Lenox, in Otis, The Boston Globe reported Friday. The camp is rented by the city of Somerville to provide team building for its fall sports teams.
The suspects are all juniors at Somerville High School.
Galileo Mondol, 17, is charged with aggravated rape of a child under the age of 16, assault with intent to rape a child under 16, indecent assault and battery, assault and battery and three witness intimidation. Theo other suspects, both 16, face similar charges. Their names were not made public because they are juveniles.
Mondol was being held on $100,000 bond, the Boston Herald reported. He will be arraigned Tuesday as an adult.
Somerville Mayor Joseph Curtalone said he was "disturbed and appalled" by the allegations.
"Be clear on this," he said, "these allegations go far beyond hazing. This is rape."
He said students must sign a form about hazing before they are allowed to go to the camp and were lectured about hazing before boarding buses to the camp Friday.
Tony Pierantozzi, the Somerville school superintendent, said the school system would conduct an investigation into a possible lapse in supervision at the camp.
Pierantozzi said 165 students and 19 adult supervisors were at the camp at the time of the alleged incident.