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But on Tuesday, alarmed citizens were calling for answers - with the Jiamusi disaster top-trending on Weibo, where it has drawn more than 1.3 billion views.

On Tuesday, authorities confirmed three were killed and one seriously injured inside the Yuecheng Gym Stadium in Jiamusi city.

Government officials and state media said seven people were in the Yuecheng Fitness Gymnasium in Jiamusi city, Huanan County, when it collapsed late on Monday.

State media said the collapse in Jiamusi city occurred at 7:20 p.m.

Jiamusi city, also on the Heilongjiang-Russia border, has yet to report local cases in the latest outbreak, but said it will be on alert for a week until Nov. 3.