A male professor was killed in his office and Delta State University was placed on lock down Monday amid reports of an active shooter on the Cleveland campus.

“Delta State University has confirmed one fatality. Campus remains under lockdown. Please stay inside and away from windows,” the school tweeted.

State, city and Delta State police, along with the Bolivar County Sheriff’s Department, were on on campus and looking for the gunman, the school said. The North Bolivar County Consolidated School District said all its campuses were locked down and that after-school activities were canceled.

University spokeswoman Jennifer Farish said the Delta State lockdown began shortly before 11 a.m. CT Monday and that students, faculty and staff are being advised to take shelter.

Bolivar County Coroner Nate Brown said a professor was shot, but provided no details. The school said emergency management officials had set up a command center on campus.

“Fortunately for us, our public safety officers and university officials have trained many of us for active shooter situations,” Don Allan Mitchell, an English professor, told The Associated Press. “Many students are locked-down in classrooms, and professors and staff members are telling them the protocol. Plus, we are all texting and Facebooking each other to make sure we are safe.”