Leavenworth ? A suspicious device that was being dismantled exploded Thursday morning at an alternative high school in Leavenworth.

Students had been evacuated after the device was found about 10:30 a.m., and no one was injured.

The device was found in an office by staff at North Broadway Education Center, said Maj. Patrick Kitchens with the Leavenworth Police Department.

It went off while technicians were trying to dismantle it, breaking some glass but causing no other damage, he said.

The technicians were using a device that shoots water at a high velocity, trying to separate the device’s components.

Police were not releasing details about the type of device while the investigation continues, he said.

Catey Edwards, communications coordinator for Leavenworth school district, said students were sent to David Brewer Elementary School to arrange rides home.

Classes today at North Broadway have been canceled, Edwards said. The school, which serves about 100 students, provides diploma completion and credit recovery programs.