Three people were killed on Friday, including two people who died during an attack while class was in session at a Wyoming community college, the police said.
One of the dead was a faculty member at the school, Casper College, in Casper, Wyo., the police said.
Many details about the attack, which occurred before 9 a.m., remained unclear late Friday afternoon. The Casper police declined to specify what type of weapon had been used or to discuss a possible motive.
A second victim, who was female, was apparently killed off campus, authorities said.
The attacker, who was male, committed suicide, said Chief Chris Walsh of the Casper Police.
The attacker was not enrolled at Casper College, and school officials said that they did not believe he had attended school there in the past.
While the motive for the killings was not clear, Chief Walsh said that the three had known one another.
There was "a known relationship between all three of them," Chief Walsh said.
A police news release said the episode "does not appear to be school motivated."
The police said a firearm was not involved in the killings, describing the weapon used only as a "sharp-edged weapon."
The authorities said that about 9 a.m. they received several 911 calls from Casper College, which has an enrollment of about 4,000 students.
Officers responded to a third-floor classroom at the campus's Wold Physical Science Center, where they found the faculty member dead. The person who apparently killed the faculty member was seriously wounded.
A class was in session at the time of the attack, the police said. It was unclear how many students were inside the classroom then.
The police, initially unsure of what had happened, immediately cordoned off the campus and ordered other area schools and a local hospital to be locked down, the authorities said.
On the college's Web site, a notice in big red letters next to a red caution triangle annnounced, "Emergency Alert, all classes and activities are canceled until further notice. Do not travel to campus."
Once the police determined that the attacker was dead, the campus was reopened, but classes for the day were canceled.
This article originally appeared in The New York Times.