PORTLAND (AP) - Security officials closed the Rock Creek campus of Portland Community College Tuesday afternoon after a threat of violence was discovered.

The school also canceled Wednesday's classes.

A college spokeswoman said a worker found a note in a restroom that threatened violence similar to what occurred at Virginia Tech last week, when a gunman killed 32 people.

Deputies conducted a sweep of the campus just before 5 p.m. No arrests have been made.

The threat was the second in a week to close a Portland-area campus.

The Vancouver branch of Washington State University was evacuated last Tuesday because of threatening graffiti discovered in a campus restroom. That threat also referred to the killings at Virginia Tech.