OMAHA, Neb. (AP) — Omaha Public Schools says it’s reviewing its severe weather procedures after parents were told they couldn’t take shelter inside an elementary school during a tornado warning.

Principal Adriana Vargas reportedly told parents of Castelar Elementary students that they would have to wait the storm out in their vehicles Wednesday around 4 p.m.

The action disturbed parents such as Jennifer Lang, who says she huddled outside the school entrance with about two dozen other parents during the storm.

District spokeswoman Monique Farmer says Vargas and other principals at crowded schools had concerns about letting more people in when space was tight inside storm shelters.

The district’s current storm guidelines don’t address what to do with people outside the school during severe weather.