(Portland, OR) -- New details are coming to light regarding a shooting that injured five people at an all-ages warehouse party in southeast Portland. KATU-2 reports the party Saturday night at the Audio Cinema Building on Southeast Madison Street was organized for teenagers by a company called Str8t [[ straight ]] Up Entertainment. The Portland Police Bureau says all five people injured are expected to be OK. A witness says he saw two men arguing outside the building before one of them fired two shots into a crowd of about 300 people inside. At least five more shots were then heard from inside the building. It's not yet clear what led to the shooting. An investigation is ongoing.