LAKE OSWEGO, Ore. -- Lake Oswego Junior High School was evacuated Friday morning after a bomb threat was found taped to the wall of a girl's restroom, according to police.

The students were taken safely to an unspecified location. The campus was already empty when police officers arrived at 9 a.m.

As a precaution, bomb-sniffing dogs from the Portland Police Bureau were brought to the school. No explosives were found.

Students were released from classes at 11:30 a.m.

All children were safe and released to their parents, police said.