The emergency services and gas engineers remain at the scene of a gas explosion in South Shields.
A woman and a man were taken to the Royal Victoria infirmary for further treatment to burns.
The next door neighbour was at work when the explosion happened early this morning.
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Sandiford, a former legal secretary originally from Redcar, was convicted of drug smuggling offences and sentenced to death in 2013.
Durham Crown Court heard that one of the male victims suffered a triple-fractured jaw, while left lying in the gutter, unconscious.