At least one person was injured Wednesday when someone opened fire on the Jackson State University campus in Mississippi.

A university spokesman said an individual was shot in the leg near the corner of Dalton and Cleary streets and was not a student, the Montgomery Advertiser reported.

A JSU police officer confirmed to the Advertiser that the suspected shooter was also not enrolled at the school.

The university tweeted it was on lockdown at 12:39 p.m. and asked students to take shelter immediately.

The university lifted the lockdown about a half-hour later, saying the suspected shooter was no longer a threat, but didn’t provide additional details.