Texas Tech University had a false alarm this morning.

Witnesses reported seeing a man with a rifle near the old business administration building at 9 a.m., said Chris Cook, director of communications for the university.

Authorities cleared the building of workers for about 30 minutes, according to Jimmy Smith, a worker on the site, being renovated for a new mass communication building.

Tech and Lubbock police went to the building and found a man with an ROTC dummy rifle, said Cook. The ROTC offices are in the old administration building.

Tech police are investigating the incident, and campus activities are returning to normal, Cook said.