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The air ambulance was called to a crash, which left one man trapped in his vehicle, on a main road near Tonbridge.
The collision happened in Hadlow Road at about 2.30pm yesterday.
Firefighters cut one man free from a van, which had crashed into a tree.
The air ambulance landed nearby and its crew helped treat the two men, who were both taken to Tunbridge Wells Hospital, Pembury, by road, one with head injuries.