CHICAGO (AP) _ Three students were shot Tuesday across the street from their high school and one was in critical condition, officials said.

The shootings happened shortly before 8 a.m. near Carl Schurz High School. Investigators interviewed people in the case but no charges were filed by Tuesday night, police spokesman John Mirabelli said.

The three male students are two freshmen and a sophomore, said Chicago Public Schools spokesman Michael Vaughn.

One was hospitalized with a head wound, said Chicago Fire Department spokesman Larry Langford. The second victim had graze wounds to the head and neck and the third was shot in the leg.

All the victims were in good condition and none of their injuries were considered life threatening, police spokesman Pat Camden said.

The identities of the victims were not immediately released.

A busy intersection divides the school and a convenience store next to where the shootings took place. Police cars blocked alleys and lined streets for hours after the shooting and again during regular school dismissal.

The owner of the convenience store said he was standing behind the counter when he heard gunshots.

``I saw kids running and I just picked up the phone and called police,'' said Mike Pandya. ``I don't feel good about it.''

Some parents said they feared for their children's safety.

``It's been getting worse every year,'' said Zulma Santos, 42, who came to the school to pick up her 16-year-old son, Joumilt Rivera.

Worried parents arrived throughout the day to withdraw some of the school's roughly 2,500 students from class. One student, junior Sandra Roman, 17, vowed never to return. She said it was her first day at Schurz after she transferred from a private school for financial reasons.