The little girl was struck as her family crossed the road at traffic lights in Acton, west London (file photo) (Image: Google)

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A two-year-old girl is fighting for her life in hospital after being hit by a moped while crossing the road at traffic lights with her family.

The 19-year-old rider, who stopped at the scene, was arrested on suspicion of dangerous driving and driving under the influence of drugs, the Met Police said.

Officers have appealed for witnesses and dashcam footage of the crash, following the incident at the junction of The Vale on Uxbridge Road and Agnes Road in Acton at around 6.35pm Tuesday.

Paramedics from the London Ambulance Service and London's Air Ambulance responded to the scene and rushed the toddler to hospital, where she remains in a critical condition.

Police appealed to people who may have witnessed the incident as they walked or drove through the area on Tuesday evening.

Detective Sergeant Nush Puvitharan, from the Serious Collision Investigation Unit, said: "The incident happened as the girl and her family were crossing the street at traffic lights while other vehicles waited.

"Some of those road users would have seen the incident, or may have recorded the events on dashcam footage and, if so, I would urge them to come forward and speak to police.

"This information could prove vital in ensuring we can piece together exactly what happened in this incident."

Officers are urging anyone who can assist the police investigation into the incident to contact the witness appeal line on 020 8246 9820.

You can also contact police via 101 or tweet @MetCC and quote CAD6736/8June.