John Bacon and Donna Leinwand Leger

USA TODAY

Police and officials at Stevenson University in Maryland issued an all-clear signal Monday afternoon following an investigation into reports there was an active shooter on campus.

Baltimore County Police said on Twitter that despite those reports, they were "uncertain if any crime was committed at Stevenson U'' at Owings Mills, Md.

Investigators were talking to two male students about the reports, police said, and investigating a pellet gun found in a vehicle parked on campus.

Police said there was no confirmation that shots had been fired. They said there were no injuries.

The school's website, which earlier had warned "active shooter reported on Owings Mills campus'' and advised students to "shelter in place,'' replaced that warning with an all-clear notice. Evening classes and events were canceled.

The school has about 3,900 undergraduate and graduate students at two campuses, one in Owings Mills and one in the Greenspring Valley.

Baltimore County police earlier tweeted that they were investigating reports of an armed suspect.

"#BCoPD have not confirmed an active shooter situation at Stevenson U," county police tweeted at about 3:22 p.m. ET.

The police tweeted that the incident began when two people saw what they thought was a person with a gun and called 911. "Entire campus is locked down at this time," police tweeted at about 3:40.

WBAL-TV in Baltimore reported that police were interviewing witnesses who saw a suspect or suspects and had surrounded the campus to search for suspects. WBAL added that police tactical teams were searching some campus buildings.

The TV station said police had found the alleged suspect's pickup, with a rifle with a scope inside. The station said the pickup had a parking pass. Police were questioning the pickup's owner, WBAL said.

There were no reports of shots fired or of injuries.