CHICAGO (CBS) — A 14-year-old boy was shot in the foot outside a West Side elementary school Wednesday night, but didn’t report his injury to anyone until the following morning.

Two other boys, ages 12 and 18, were also shot in the incident at 7:10 p.m. Wednesday in the 1400 block of South Christiana Avenue, police said.

All three suffered gunshot wounds to their feet when shots apparently were fired from a passing car, which is believed to be a purple Pontiac Grand Prix, Perez said. The 12-year-old and the 18-year-old were taken Wednesday night to Mount Sinai Hospital, both in good condition.

The 14-year-old was either with the other two boys or near them when he was shot, police News Affairs Officer Robert Perez said. He suffered a gunshot wound to the bottom of one foot.

But it wasn’t until Thursday morning, when he went to school at the Lathrop Elementary School, on the very same block at 1440 S. Christiana Ave., that he informed the school nurse of the injury.

The nurse called 911 and the boy was taken by paramedics to Mount Sinai Hospital, where he was in good condition, according to Fire Media Affairs spokesman Rich Rosado.

There were no reports of anyone in custody in the shooting as of early Thursday afternoon.

The Sun-Times Media Wire contributed to this report.