A young man reportedly stabbed at least four U.C. Merced students inside a university classroom before responding officers shot and killed him early Wednesday morning.

According to reports, the assailant—who has not yet been identified—was a male student in his twenties. Merced County Sheriff Vern Warnke tells ABC 30 the suspect was shot and killed by university police officers.

The total number of victims is still unclear, but KCRA is now reporting that at least five people were attacked.

According to ABC 30, medics are treating at least three of the victims on campus while a fourth was airlifted to a nearby hospital.

It’s still unclear what time the attacks began, but an alert warning students to stay off campus went out around 8 a.m. Wednesday.

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