NEW : South Korean President Park Geun-hye expresses condolences to victims ' families . More than 100 people are injured , two of them seriously . The attack happened at a crowded market in the city of Ansan, about 50 km from Seoul. A resort building in the city of Gyeongju collapsed , South Korean news agency says .
NEW : South Korean President Park Geun-hye expresses condolences to victims ' families . More than 100 people are injured , two of them seriously . Busan University of Foreign Affairs students were at welcoming party off campus . A resort building in the city of Gyeongju collapsed , South Korean news agency says .