Multiple people were shot at Lone Star College in Texas on Tuesday, according to local news reports.
An alert posted on the school's website warned students to take shelter.
"LSC-North Harris is locked down," the alert read. "Students, faculty and staff are advised to take immediate shelter where you are. Do not enter the campus until notified further."
Aerial footage showed SWAT team members evacuating students several buildings on the campus in North Harris County near Houston.
In interviews with local media outlets, students described a chaotic scene. A female student told KTRK-TV heard five shots fired in an area between the library and the cafeteria. Other students say they heard gunshots when they were in cafeteria.
The Lone Star College System has a total enrollment of more than 90,000 students across six campuses, according to its website.