Seven people were in the gym when it collapsed, of which three escaped and one was rescued. Two of the survivors are in hospital. The gym is located near a residential area in Huanan County in the city of Jiamusi, Heilongjiang province. Photo: Xinhua

The building — a 2-story, 3,209-meter structure — was blanketed in snow by a blizzard that swept through the region on Monday. A 675-square-meter section of the second floor, housing a basketball court, caved in. Photo: Screenshot from CCTV.com

The gym is an independent concrete building standing at just over 9 meters tall. Photo: Xinhua

The site of the collapse on early Tuesday morning. Photo: Wang Chunyu/Xinhua

Rescue equipment is set up at the site. Photo: Xinhua

Firefighters enter the collapsed gym to rescue trapped people. Photo: Xinhua

In July, in nearby Qiqihar, the roof of a middle school gym collapsed following heavy rains, killing 11 people. Photo: Caixin

The gym after it was freshly built. The construction of the gym began in July 2017 and was completed a year later. The gym opened in July 2020 after the construction passed the safety approval. Photo: Baidu Map