Story highlights

Gunman had been reported at Indiana-Purdue Indianapolis

Campus all-clear issued hours after it was put on lockdown

University did not say whether a gunman was found

CNN  — 

A lockdown imposed Tuesday afternoon at Indiana University-Purdue University Indianapolis has been lifted, according to the school’s Twitter account.

Students and staff at the university had been asked to take shelter earlier Tuesday afternoon while police investigated a report of an armed person on campus.

According to the school’s Twitter account and website, students were to “remain in shelter location until an All Clear is received.”

That all-clear message came at 4:36 p.m. “Now returning campus to normal operations,” the tweet read. The school did not say whether any gunman had been found.

About 30,000 students go to the school in Indianapolis.

CNN’s Jim Kavanagh contributed to this report.