( CNN ) -- A 19-year-old mathematics major from Austin , Texas , was identified Tuesday as the suspected gunman who fired shots from an AK-47 and then turned the gun on himself , the University of Texas at Austin said . The Travis County Medical Examiner identified Colton Tooley , a sophomore at the university , as the campus shooter . No one else was injured in the incident . Tooley 's motive was not immediately known . According to the university , Tooley began firing the AK-47 near the Littlefield Fountain at about 8:10 a.m. Officers from the University of Texas Police Department and the Austin Police Department pursued Tooley , who went into the Perry-Castaneda Library . He killed himself at the library during the incident , police said . Austin and University of Texas police were searching Tooley 's home in south Austin , CNN affiliate KXAN reported . Police were checking campus buildings for possible explosives left behind , said Austin Police Chief Art Acevedo . Authorities said earlier they were searching for a possible second suspect , but Robert Dahlstrom , chief of staff in the Austin Police Depart , said they now do not believe there is one . `` A suspected shooter in PCL library is dead , '' said an alert posted on the university 's emergency website at 10:30 a.m. `` If you are off campus , STAY AWAY . If you are on campus , lock doors , do not leave your building . All organized classes for today , September 28 , are canceled . '' The campus had been on lockdown since an alert went out , but spokeswoman Rhonda Weldon said students were allowed to leave , and shuttle buses were to transport students and staff away from the campus . The university canceled all classes for the day . An ambulance was seen just before 9 a.m. in front of the Perry-Castaneda library , CNN affiliate KXAN reported . SWAT teams , armored vehicles and helicopters surrounded the campus . `` I extend my sympathy to the family , friends , and classmates of the young student who took his life , '' said university President Bill Powers , who thanked police for their response to the emergency . `` In the days ahead we will attempt to understand his actions and to learn from this tragedy . '' University of Texas professor Randall Wilhite heard gunshots on his way to class and saw students scrambling to safety . He said he saw a man in a dark suit and a ski mask pulled over his face running toward the direction of the library a little after 8 a.m. Wilhite said the man was carrying what appeared to be an assault rifle and fired it randomly . `` When I pulled up in my car , he stood right in front of me and did n't stop running but turned in my direction , fired three shots into the ground to the left of my car and kept running . I was n't sure it was real until I saw the bullets strike the ground to my left . '' Student Micah Geisenberg was already on a bus to the university when he received an e-mail alert to stay away . `` It 's chaos right now , '' said Geisenberg , who heard a gunshot as he got off the bus near the library . Matt Holiner heard a series of loud bangs from his dorm room , a couple of blocks south of the library . He suspected they might be gunshots , especially when he saw people running away . By mid-morning , there were at least 10 police cars outside his window . `` It 's been quite an exciting morning to say the least , '' he said . The library is about two blocks from clock tower , where student Charles Whitman went on a shooting spree after killing his wife and mother . On August 1 , 1966 , Whitman , 25 , killed three people in the tower and then another 10 from the tower 's observation deck before police shot him dead . His actions were blamed on narcotics abuse coupled with health , family and legal problems . CNN 's Devon Sayers contributed to this report .
the Perry-Castaneda Library identified as Austin Police , Tuesday , of Texas . Officials do n't believe there was a second gunman . Students are allowed to leave . The gunman has died and no one else was injured .