In doing so, the other women seem to force her into the water from behind.
The two women are seen falling into the tank during the incident which happened on Wednesday.
Police have confirmed the two drowned, Yahoo News reports.
CCTV of the shocking incident went viral in China with an investigation launched on Thursday.
Internet users have speculated on the cause of the shocking events.
Police are expected to release details of their investigation into the two deaths in due course.
They believe the woman who pushed her friend is suffering from depression and was prescribed medication, according to reports.
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