At least two students were shot at a suburban high school in Colorado on Wednesday afternoon, the authorities said.

The shooting took place on the campus of Evergreen High School in Evergreen, Colo., about 30 miles southwest of Denver, according to the Jefferson County Sheriff’s Office.

The students were taken to an area hospital, the authorities said. Their conditions were not immediately known.

It was not clear what had led to the shooting, who fired the shots or if a shooter was in custody. The sheriff’s office did not immediately provide further details on the shooting.

The high school, which has about 900 students, is part of the Jefferson Public School District, according to the state’s Department of Education.

The school district did not immediately respond to inquiries about the shooting.

Agents from the Denver division of the U.S. Bureau of Alcohol, Tobacco, Firearms and Explosives said they were also responding to the shooting.

This is a developing story.