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A photo contributed by Ivy via WhatsApp shows the victim being attended to by paramedics.
"Not sure how the accident happened as the woman was already lying on the road when I passed by the scene."
A spokesperson for the Police told Stomp in response to media queries:
"Police received a call on 4 September 2016 at about 1.30pm, informing us of an accident at the junction of Jurong West Avenue 4 and Jurong West Street 75.
"Upon arrival, it was established that an accident involving a car and a pedestrian had occurred.
"A 27-year-old female was conveyed unconscious to NUH.
"Police investigations are ongoing."