(BCN) — Novato police are investigating a stabbing at an elementary school after school hours Monday evening that left a 16-year-old with critical injuries. Officers responded at 6:50 p.m. to a report of a group of teenagers causing a disturbance at Lynwood elementary school, where staff members were working into the evening, but no students were present, police said.

Witnesses reported several teens fleeing in a vehicle, leaving the 16-year-old suffering from multiple stab wounds in the school’s parking lot. He was taken to a hospital and remained in critical condition Tuesday, according to police.

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Investigators learned a 17-year-old boy was also assaulted by the group of suspects but suffered only minor injuries and was released to his parents. No information about the suspects was immediately available. anyone with information about the case is asked to call (415) 897-1122 and refer to case #np22-3902.