Two students are in custody after a small explosive device was found in the possession of one of them at Seminole High School.

Police bomb dogs were called in after one student reported seeing another with a suspicious device. A police spokeswoman says they found what they describe as a "stinger" — a carbon dioxide cartridge filled with gunpowder and apparently rigged to explode.

The device did not detonate and no one was injured. The students, both juveniles, are being questioned.

Classes resumed in the afternoon after a three-hour lockdown.