The marked police car was travelling with its sirens on when it hit a tree in inner-city Sydney about 1.30am on Friday

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A New South Wales police officer who was killed on duty when the car she was travelling in crashed into a tree in Sydney has been named as 20-year-old Mia Lay.

NSW police said the marked police car was travelling under lights and sirens along Gibbons Street in Redfern when it crashed at about 1.30am on Friday.