LAKE OSWEGO, Ore. -- A bomb threat note found Monday morning at Lake Oswego High School prompted officials to open the school two hours late. It was the third such threat in the last two weeks.

The threat was written on a note taped to the front door of the school. Staff members found the note at about 6 a.m.

Police went room-to-room to investigate and announced shortly before 9 a.m. that all was clear.

Buses ran on regular schedules, but students were dropped off across the street at Lake Oswego Junior High.

Two weeks ago, a bomb threat was called into Lake Oswego Junior High and on Friday a second threat was phoned in. Students were evacuated both times.

Police said the pranks keep them from real emergencies.

Anytime you're dealing with something that may be a hoax, there's a tendency for it to be kind of infectious and you kind of get into this cycle that's hard to stop, said Nancy Duin with the Lake Oswego School District.

Lake Oswego High School student Nicholas Arjavac found the situation frustrating.

I just think that it's somebody that doesn't really want to go to school, Arjavac said. It doesn't scare me that much, it's just kind of annoying.

Police said the junior high school and high school threats may have come from different people.

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