TUCSON, Arizona (CNN) -- A gunman believed to be a student shot to
death two professors and a third person before apparently killing
himself Monday at the University of Arizona College of Nursing,
police and university officials said.
The building where the shootings occurred was swept for explosives
afterward because of concern that the gunman might have had a bomb,
Tucson Police Chief Richard Miranda would not say what, if anything,
police found in the sweep. In a statement on the Internet, the
university said two professors -- who witnesses said were women --
were shot. The fourth victim was found in the building during a
search, police Sgt. Marco Borboa said. The victim was not identified.
Miranda said the gunman was among the victims, and the university Web
site said he may have died from a self-inflicted wound.
Miranda said police learned Monday morning that the suspect had
threatened to bomb the building in the last few weeks. He didn't say
from where the information came.
The chief also said a bomb-sniffing dog had a reaction to the
suspect's car, which was parked in a lot outside the college, and
when police found a backpack under the body of the gunman, they
suspected it might contain an explosive device.
Police are confident that the gunman acted alone, he added.
"I am personally comfortable that there is no further risk,"
university President Peter Likins said. "It's an intensely personal
tragedy and trauma."
A witness said a student angry over being barred from midterm exams
entered a classroom where exams were being given and began shooting
with a handgun. Police would not confirm that it was a student.
The witness said the gunman fired at one professor as a number of
students ran out of the classroom, then fired at a second professor.
The gunman, he said, then allowed the rest of the students in the
room to leave.
A witness taking the test on the fourth floor of the building said
she heard about 15 gunshots. It was "really scary," she said. "It was
silent while he was shooting our teachers. I was afraid that I was
going to get shot."
University spokeswoman Lisa Wakefield said that the college and
surrounding buildings were evacuated after the shootings at 8:40 a.m.
(10:40 a.m. EST). In addition to the College of Nursing, other
buildings closed included the College of Pharmacy, Life Sciences
North and Basic Sciences, police said.
The University Medical Center was locked down, and emergency cases
were being diverted to other hospitals, a spokeswoman said. Visitors
were barred, but she said employees were able to go in and out.
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Police said people who fled the college after the shootings were
gathering at a nearby alumni center, where counseling was available.