(Sherwood, OR) -- A person playing with their dog is credited with finding a homemade bomb at Sherwood Middle School last night. It was a ball wrapped in tape and had a fuse sticking out of the top. The Explosive Detonation Unit confirmed it was a bomb and destroyed it. Explosives experts say these are common devices that can be activated from fuse, friction, or puncture. They can be very dangerous. Police checked the school's property, other schools, parks and fields for other devices.