Authorities are investigating an explosion in Allyn Thursday evening. The explosion occurred the garage of a Lakeland Village home about 6:30 PM. The Mason County Sheriff’s Office says no illegal activity was involved but there were old blasting caps and explosives in the garage. Crews from Central Mason Fire & EMS were the first to respond to the scene. The homeowner suffered minor injuries and was transported to the hospital as a precaution. The home sustained substantial damage. The bomb squad is now investigating.