The University was put under lockdown just after 8 a.m., after at least six shots were fired on campus by an unknown gunman. The gunman, who officials said appeared to be a UT student, is now confirmed dead.

Authorities were investigating reports of a second suspect, but later confirmed there was only one suspect involved.

Dobie maintenance worker Ruben Cordoba was working on the plaza level of the complex, which is three stories above the street. He said the initial suspect and only confirmed gunman was described as a young man wearing all black and a ski mask.

Cordoba said he saw the gunman walking down 21st Street from Gualadupe Street towards campus, carrying an automatic weapon.

As the gunman approached the University Catholic Center, he fired three shots in the direction of the church and then another three shots towards the South Mall, which is directly across the street.

The gunman then walked towards the Perry-Castañeda Library. He was found dead on the sixth floor of the building and police officials said he committed suicide. There were an unknown number of shots fired in the library, police said.

University spokeswoman Rhonda Weldon said this morning that no one was hurt, other than the shooter who killed himself. Weldon said police will begin an "orderly evacuation" of the campus. All UT shuttles will resume operation with the exceptions of the Forty Acres and East Campus, according to an e-mail from Capital Metro spokesman Adam Shaivitz. She said the investigation has tightened to the area directly around the PCL.

Classes and scheduled campus events will resume tomorrow.