The University of Southern Alabama lifted a campus-wide lockdown Sunday night, but urged students to be wary as an armed robbery suspect remained at large.

In a statement, university spokesman Keith Ayers said a student from one of the university's residence halls reported he was robbed at gunpoint by two men he had invited to his room shortly before 3:00pm local time.

"The two individuals robbed him of approximately $1,000 and his cell phone and fled. A shot was fired but no one was injured," the statement said.

"This afternoon, after an extensive search, USA Police took one suspect into custody and now believe the second suspect has left campus."

Neither of the two suspects were believed to be students at the university, located in Mobile, Ala.

The incident had earlier prompted a lockdown and an alert on the university's website advising students to take shelter and remain indoors.

The remaining suspect is described as being a black male, with a thin build, dark complexion, and a short Afro hairstyle.