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By Alexander Smith and Alastair Jamieson

LONDON — An 18-year-old American woman remained in a critical condition Friday after being hit by a subway train in London, police told NBC News.

The teenager was traveling in a group when she was struck at Bond Street station, in one of the capital's main shopping areas, the British Transport Police said.

The incident happened at around 7:30 p.m. (2:30 p.m. ET) Thursday. Police, fire and ambulance crews rushed to the scene and the woman was taken to hospital, where she was still listed as critical Friday.

A London Underground sign outside Westminster Station in London, Britain, on July 8, 2015.ANDY RAIN / EPA, file

The BTP said they were treating it as an accident.

The London Evening Standard quoted a Transport for London worker as saying that the woman was leaning over the platform to look at a mouse on the tracks when she was struck, although this was not confirmed by NBC News.