An attacker stabbed five students on the campus of a California university on Wednesday and was later shot and killed by police, school officials said.

The University of California Merced put out several short statements on Twitter saying the campus hadU been locked down after the morning incident and classes were canceled. It urged students to stay where they were.

Two of the stabbing victims were flown out by medical helicopter and three were treated on campus, the school said. All were conscious, it added.

The school initially said the suspect had been apprehended, but campus police later said officers had shot and killed the suspect.

Further details were not immediately available.

The stabbing attack comes about a month after a gunman killed nine people at a community college in Oregon, ranking it among the deadliest of dozens of U.S. mass shootings over the past two years.

The city of Merced, where the newest addition to the University of California system is located, is some 135 miles southeast of San Francisco.