HOUSTON (AP) — A Houston-area community college went into lockdown Tuesday afternoon amid reports of a shooter on campus.

Lone Star College System issued an alert on its website Tuesday telling students and faculty on its Houston-area campus in north Harris County to take immediate shelter or avoid the campus. College spokesman Jed Young said it had received reports of a shooter.

Aerial footage from local television stations showed police cars and ambulances parked on the campus, emergency personnel attending to people on stretchers and at least person being put into an ambulance. Other people could be seen running from a building led by officers.

The Harris County Sheriff's Office had no immediate details.

The Lone Star College System has an enrollment of 90,000 students and six college campuses, according to its website. Its North Harris campus is about 20 miles north of downtown Houston.