JACKSONVILLE, Ark.—Jacksonville High School was locked down Monday afternoon as a safety precaution after police notified school officials of “an incident” in a nearby neighborhood, interim Principal Kathleen Crumby said.

Crumby said students were not allowed to go outside as of about 2:50 p.m. Students who take cars home were allowed to leave a couple of minutes before students who take buses home were dismissed at the usual time of 3:55 p.m., Crumby said. The only students who remained inside after dismissal were those who walk home through the neighborhood where police were working, she said. Some middle school students were among that group, she said.

Crumby said she did not have any details about the neighborhood activity. KATV television station reported that a man had barricaded himself inside a home after firing shots from a semiautomatic weapon. Jacksonville police provided no further details.

The high school has 1,047 students in grades 9-12.