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A road was closed and a man taken to hospital with serious injuries after crashing his e-scooter.
Police were called to Hartley Road, Cranbrook, alongside the ambulance service at around 7.30pm yesterday.
Officers are now appealing for more information after a man in his 30s was taken to a London hospital.
Police don't think another vehicle was involved in the collision.
A spokesman for the force said: "Kent Police's Serious Collision Investigation Unit (SCIU) is investigating and officers urge anyone who witnessed what happened, or who has CCTV or dashcam footage which may assist, to come forward."
The road was reopened hours after the incident.
Anyone with information should call the SCIU appeal line on 01622 798538.
Alternatively, email sciu.td@kent.pnn.police.uk, quoting reference XX/MS/105/22.