Leavenworth High School was evacuated Wednesday morning after a bomb threat was made by telephone. Students returned to their classes after police searched the school, a school district spokesman said.

Leavenworth High School was evacuated Wednesday morning after a bomb threat was made by telephone. Students returned to their classes after police searched the school, a school district spokesman said.

Jake Potter, director of public relations, said the main office at the high school received an anonymous call at 10 a.m. The caller communicated a bomb threat.

“We immediately dismissed all students and staff outdoors to the stadium,” Potter said.

The stadium is located on the high school grounds.

Potter said police officers conducted a comprehensive and thorough sweep of the school.

Maj. Dan Nicodemus, deputy chief of the Leavenworth Police Department, said a school resource officer, who is a member of the Leavenworth Police Department, was already at the high school. Additional on-duty officers responded to the high school as well as the local bomb squad.

As part of their search, police officers flew drones over the high school grounds.

“It covers a lot of area a lot faster,” Nicodemus said.

No explosive device was found during the search.

Potter said the anonymous phone call was the sole reason for the evacuation and subsequent search.

“There was not any physical evidence, or any video or suspicious item,” he said.

As the search was being conducted, some parents arrived at the stadium to pick up students.

Potter said police officers gave the “all clear” at about 11:30 a.m. and all remaining students and staff members returned to the building.

Potter said school officials will try to determine the source number of the anonymous call.

Twitter: @LVTNewsJohnR