The M27 has been closed westbound due to an accident at Burseldon.
An air ambulance is due to land after a lorry driver was cut free from the cab.
Three lorries were involved in the crash.
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The council says hoardes of people are driving long distances to come to Lulworth and Durdle Door despite pleas to stay away.
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A parachute was deployed when the plane came down off Calshot Spit. Those on board were rescued by a passing boat