( CNN ) -- A day after 16 died in an accident at a concert in South Korea , a man responsible for safety measures was found also dead , the country 's semi-official news agency reported . It was an apparent suicide . On Friday , a ventilation grate gave way , and more than two dozen people standing on it plunged some 20 meters ( 66 feet ) -- or four stories -- into an underground parking structure below , a government accident response task force said . In addition to the deaths , eleven people were injured , three seriously . On Saturday , the body of the 37-year-old safety official was found on a street near his office , Yonhap news agency reported , citing police . They think he jumped to his death . He left a brief message on his Facebook page . `` I apologize to the victims . I 'm sorry to my family . '' On Friday , Prime Minister Chung Hong-won inspected the gaping concrete hole that swallowed up concertgoers . Some media reports indicate the victims were standing on the grate in order to get a better view of the stage . A witness told CNN affiliate YTN , `` There was a sudden , loud screaming and when I turned , it looked as if people were being sucked down into a hole . '' About 700 people were attending the concert , which featured South Korean artists , including the popular all-female group 4Minute , Yonhap reported . A ferry sinking in April killed more than 300 people , many of them schoolchildren , and caused nationwide outrage . Critics contend safety measures and regulation are not keeping pace with the fast-paced economic development in the country . CNN 's K.J . Kwon contributed to this report .
The official handled security at a concert , where an accident killed someone on Friday . A ventilation shaft gave way , dropping more than a dozen concert goers four stories . The man was pronounced dead on Saturday . He posted a message to Facebook apologizing to the victims and his family .