OLYMPIA  (AP) — Classes are resuming at a small college in Washington state after protests on the progressive campus attracted national attention — and threats.

The Evergreen State College in Olympia reopened its campus as of 3 p.m. Monday. Administrators didn't immediately provide further explanation.

The college was closed for the third consecutive weekday for much of Monday. Officials said police were reviewing new "external threat information" received over the weekend.

Recent protests followed a white professor's decision to oppose an event in which organizers asked white students to leave campus for a talk about race. The event was a reversal of the college's longstanding annual "Day of Absence," in which minorities attend programs off campus.

Biology professor Bret Weinstein, who has taught at Evergreen for 15 years, wrote an op-ed piece in the Wall Street Journal saying he was called a racist because he had "challenged coercive segregation by race."