ut austin

A gunman wearing a ski mask and brandishing a shotgun entered a library of the University of Texas at Austin today and shot several times before taking his own life, causing a blockage around the campus and fears that a second shooter may be on the loose.

Shortly before noon, central time, a campus lock in place for about 8 hours rose, ending a search for a possible second suspect. "The armed suspect is dead. No other injuries were reported," UT President Bill Powers wrote in a campus e-mail.

The gunman was found dead on the sixth floor of the library apparently self-inflicted wounds, police said.An email and SMS alert sent to students and teachers about 8 hours, as the day of the first classes began warns that an "armed men were reported recently in Perry Castaneda Library" and telling students to stay in place.

"I went to class a little late," said senior Robby Reeb ABCNews.com. "I ran out of the business school, and a man running past me screaming, 'There's a man with a gun." I looked up and saw a man with a ski mask, a suit and carrying an assault rifle. And I called 911. "