“When paramedics arrived on scene Saturday night, the carbon monoxide meters affixed to their medical bags immediately went into high alert upon entering the lobby of the theater…discovered levels of anywhere from 250 to 350 parts per million…Paramedics then called for additional fire personnel to arrive on scene in order to determine the cause of the carbon monoxide leak and the remaining patrons at the venue were evacuated. Eventually, officials reported finding the apparent culprit: three gas-powered generators in a partially-enclosed, outdoor service area that were being used to provide additional power needed for the band’s performance…”

Cleveland Hts. venue closed after reported CO leak (news5cleveland.com)