LAKE OSWEGO, Ore. - Police are investigating a bomb threat found at Lake Oswego High School Monday morning.
The school district announced that Lake Oswego High School would start two hours late Monday morning while police searched the building.
Police said the building was safe at around 8:30 a.m.
Superintendent Bill Korach told KATU the threat was found on a note taped to the building. The school district previously said the threat was called in by phone.
The school district tweeted that buses would run at regular times. Students riding buses to the high school were dropped off at Lake Oswego Junior High School and waited there while police secured the building.
Korach said there have been two recent bomb threats at Lake Oswego Junior High School, including last Friday. He believes someone is harassing the school.
Korach says they take all threats seriously.
"There was a time where we really could make judgements about these things and the likelihood. Anymore, you can't take anything for granted," he said.
Police are investigating the threats.
KATU's Mary Loos contributed to this story.