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The air ambulance and paramedics were scrambled after a man was crushed by a dumper truck at Fort Halstead near Sevenoaks.
The man, aged in his 40s, was taken to Tunbridge Wells Hospital with a fractured leg.
He was fully conscious when he was taken by road to the hospital, but was transported as a priority patient.
The incident on Crow Drive happened just before 9am yesterday.
It is thought to have been an accident, but police were also called to the scene to investigate.