It happened on the B3081 near Verwood - he had to be cut free by firefighters.
'Abducted' Children Found Dead
Two children, allegedly abducted by their German mother from the custody of their British father, have been found dead in Turkey.
Yaanis Mellersh, eight, and his sister Mira, six, were discovered in the seaside town of Soke on November 18 along with their mother, Elke Mellersh, 45.
The children were supposed to be in the custody of Justin Mellersh, 46, from Lyndhurst in Hampshire, but were reported missing in February last year.
A Facebook page dedicated to trying to find the youngsters said:
"On November 18th 2011, all three were found dead in Turkey. Elke had committed suicide and taken the kids with her. This had been our greatest fear."
Another post added:
"We do not blame the mother for this tragedy, it's clear that she suffered a debilitating mental illness with paranoid delusions. Rather we mourn that we were not able to ease her inner pain and confusion, and so were unable to prevent this sad, sad end."
The Daily Mail said that Turkish reports suggested the family died of carbon monoxide poisoning - possibly from a heater.
The farmhouse's windows had been taped up and a note left on the front door stating: "Caution: Toxic."
The Foreign Office confirmed the deaths of two minors in Turkey.
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