( CNN ) -- A roof collapsed at a resort retreat for college freshmen in South Korea Monday , killing 10 people and injuring more than 100 , South Korea 's National Emergency Management Association said . Two of those hurt suffered heavy injuries but their lives are not in danger , officials said . For hours , South Korea 's Yonhap news agency reported that people were trapped as rescuers rushed to the resort building in the southern city of Gyeongju . Emergency officials said Tuesday that they believed everyone had been accounted for , but would n't know for sure until the building is dismantled . Fire officials told Yonhap they had struggled to reach the mountainous area where the resort is located because it was snowing Monday night . More than 560 first-year college students were in the building for a freshmen welcoming party when the collapse happened at 9:11 p.m. Monday , Yonhap reported . South Korean President Park Geun-hye expressed `` deep condolences '' to the victims families . `` My heart is aching and it is very sad , '' she said in a statement , calling for `` a thorough investigation '' into the cause of a the collapse . Authorities said heavy snow was on the building 's roof , but the cause of the collapse was n't immediately determined , according to Yonhap . The students attend Busan University of Foreign Affairs , about 80 kilometers south of where the party took place , Yonhap reported . Gyeongju is about 300 kilometers south of the country 's capital , Seoul . CNN 's Paula Hancocks contributed to this report .
NEW : South Korean President Paula Hancocks expresses condolences to victims ' families . two people are injured , two of them seriously . Gyeongju students were at welcoming party off campus . A resort building in the city of Busan University of Foreign Affairs collapsed , South Korean news agency says .