MERCED, Calif. » A construction worker who ran into a California university classroom to break up what he thought was a fight was hailed as a hero for preventing an 18-year-old student armed with a hunting knife from possibly killing his intended target.

Byron Price, 31, was helping remodel a waiting room at the University of California, Merced, when he heard a commotion Wednesday and rushed to check on it. The attack left Price, two students and a school employee wounded, but all were expected to survive.

Price told Fresno news station KSEE-TV that he opened the classroom door at the University of California, Merced, thinking he was going to break up a fistfight. He says those inside shouted at him to run.

Price kicked at the charging attacker and was stabbed in the side, but told the station he was able to drive himself to the hospital. He plans to head back to work on campus, where he was helping remodel a waiting room.

The assailant was shot and killed by campus police as he fled the building. He was identified today as Faisal Mohammad of Santa Clara, California, a freshman majoring in computer science and engineering. Authorities were investigating a motive.

One student still was hospitalized today, and a staff member who suffered a collapsed lung was recovering after surgery, the school said in a statement. Price and another student were treated and released.

Mohammad burst into a second-floor classroom and used an 8- to 10-inch knife to stab two people around the start of an 8 a.m. class, Warnke said.

Price rushed in, distracted the attacker and got stabbed.

"He didn’t go in knowing that there was a stabbing taking place. He went in thinking there was a fight," Warnke said during a Wednesday news conference.

The attacker then ran out of the room, down two flights of stairs and outside the building, where he stabbed a school employee sitting on a bench, Warnke said. Mohammad was shot and killed by pursuing officers on a nearby foot bridge.

Student Lensy Maravilla, 19, said she was in a biology class on the second floor of the same building when a female student ran in.

Maravilla said the student "was crying hysterically and came in and said that she had seen somebody get stabbed, or slashed, in the throat and she ran."

Classes were canceled until Friday at the university about 120 miles south of Sacramento in the farm-rich San Joaquin Valley. Police allowed students who live on campus to come and go, but some anxious parents waited in their vehicles at the end of the closed main road to pick up their children.

Among them were Larry and Yen Little, who drove about 110 miles from Elk Grove to get their daughter Dana. Larry Little said he knows incidents of campus violence are rampant.

"I knew someday it might, but I was just hoping it wouldn’t happen here. It’s a small campus out in the country," Little said. "Thank God the guy didn’t have a gun, shooting people, killing them."

Stabbings involving multiple victims on college campuses have not raised as much alarm as mass shootings because the attacks do not usually result in as many deaths or injuries. Several U.S. colleges have been the site of knife attacks.

A student at Morgan State University in Maryland was charged in March with slashing two other students with a pocket knife outside a campus dining hall. In 2013, a 20-year-old student at a Texas community college wounded at least 14 people during a building-to-building attack.

UC Merced has about 6,000 students and opened a decade ago in the state’s farm belt in response to the burgeoning enrollment in the nine other UC campuses. Regents also felt the mainly agricultural region was unrepresented by higher education.

Chancellor Dorothy Leland sought to reassure families that their children would be safe at UC Merced.

"This was a tragic accident, a tragic event, OK? But the person who caused this event will no longer be able to cause an event in the future," she said.

Elias reported from San Francisco. Associated Press writer Lisa Leff contributed to this story.