A spokesman for the Land Transport Authority (LTA) said that it "takes the issue seriously and will be investigating the cause of the incident". The escalator in question is located in the MRT station underpass, near to Tangs department store. It will remain closed while the LTA investigates the matter.
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According to a Singapore Civil Defence Force spokesperson, a call was received at about 7.36pm on Monday, Dec 23.
Two ambulances were sent to the scene, with six persons conveyed to hospital.
Two women - one in her 40s and another in her 60s, were sent to Tan Tock Seng Hospital, while two girls aged 13 and 11 were conveyed to KK Women's and Children's Hospital.
According to the Shin Min Daily News on Tuesday, the injured woman in her 60s is believed to be an Indonesian. The two girls are her grandchildren.
The elderly woman suffered a fractured backbone, reported the Chinese evening daily, while two others suffered bruises and lacerations.