Cause of tower block fire probed

Forensic experts and fire officials are investigating the speed at which a fire spread through a south London tower block killing six people.
London Mayor Boris Johnson will meet with fire crews who fought the blaze at Lakanal House in Camberwell.
Several residents have described the layout of the block, which only had one central staircase, as "a maze".
Three women and three children died in the fire, believed to have spread from a flat on the ninth floor on Friday.
The mayor is yet to visit the scene.
Helen Udoaka, 34, her three-week-old daughter Michelle, Dayana Francisquini, 26, her son Filipe Francisquini, three, daughter who has been named in media reports as Thais, six, and Catherine Hickman, 31, lost their lives in the blaze in the 12-storey building.

Twelve people received treatment at hospital following the fire.
The single staircase is being investigated after questions were raised over whether there were adequate escape routes and fire prevention measures.
The London Fire Brigade said a "unique situation" caused "one of the most significant fires in some time in terms of lives lost".
About 100 firefighters tackled the blaze which began on Friday afternoon. Officers said it could be "some weeks" until the cause is known.
Earlier the leader of Southwark Council, Councillor Nick Stanton, said the design of the building was "not untypical and met all the fire safety requirements laid down at the time of its construction".
He said the council had spent £3.5m refurbishing the building and meeting current safety fire requirements. </p
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