Witnesses say bomb blasts at two American fast food restaurants in Pakistan have injured at least three people. The two minor explosions were minutes apart late Thursday in the southern city of Karachi, striking a KFC and a McDonald's. Police say the first bomb exploded at the KFC in the upscale Defense district. Witnesses say several people were injured, some by glass fragments from windows blown out by the explosion. About eight minutes later, a second blast shook a beach-front McDonald's. It is not clear if anyone was injured in that incident. Police describe the bombs as low-intensity, homemade devices.