Allen said police believe the shooting may have been the result of a domestic dispute. He didn't know the relationship between the victims and the shooter.
Conor Duff, the college's evening coordinator, said the outbreak of violence was startling.
"Everybody here's been pretty shook up," he said. "This is definitely something people around here are not used to. We have our fair share of problems, but normally this isn't one of them."
Classes had resumed Monday at the campus after the holiday break, according to the college's website, which also posted that there had been an incident and asked students to stay away from the main campus. The school called off classes for Wednesday.
The college's academic programs range from associate's degrees in arts and sciences to career-focused training in mining technology and heavy-equipment operation.
Associated Press writers Janet Cappiello and Teresa Wasson contributed to this report.