Nebraska ? Fire broke out in a fraternity house early Friday, killing one student and critically injuring three others, officials said.

The blaze started about 4 a.m. in a second-story room at the Phi Kappa Tau house at Nebraska Wesleyan University, said Lincoln Fire Chief Dan Wright. At least 39 people were inside.

The fire was under investigation.

Three students who had been in the house said they couldn’t recall hearing an alarm, but Wright said somebody had pulled it.

The smoke alarms worked, university spokeswoman Sara Olson said.

Olson said all four students were members of Phi Kappa Tau. She identified two of the hospitalized students as David Spittler, 20, of Elkhorn and Travis Mann, 22, of Beatrice.

Both suffered smoke inhalation and were in critical condition, said Jan Yaussi, St. Elizabeth Regional Medical Center spokeswoman.

The third student in critical condition was Aaron McGuire, 20, of Sioux Falls, S.D., who also inhaled smoke, Yaussi said.

The student who died was Ryan Stewart, 19, of Ord, she said.