The death toll from the London tower block fire has risen to at least 30 and police are considering whether criminal offences had been committed, a senior police officer said on Friday.

"We know that at least 30 people have died as a result of this fire," said Commander Stuart Cundy, adding that the figure was expected to rise.

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He added that 24 people were still in hospital and 12 were receiving critical care.

"The investigation will look in into what criminal offences may have been committed," Cundy said.