Three people were injured, two in critical condition, in a shooting Monday afternoon at a charter school near downtown Des Moines, Iowa, authorities said.

The calls for help came in around 12:50 p.m. Paul Parizek told reporters at the scene.

The ages and affiliations of the victims were not immediately clear. But one is believed to have been an adult employee of the school and two others «could have been students,» Parizek said.

Police officers «have multiple potential suspects in custody,» according toDes Moines police statement.

The Iowa shooting comes in the wake of other troubling shooting incidents across the United States. Eleven people were killed at a dance studio in Monterey Park, California, on Saturday night and 12 people were shot inside a bar in Baton Rouge, Louisiana, early Sunday morning.

This is a developing story. Update here for updates.