BBC News
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image captionGeorge's parents said the two-year-old "was so precious to us"
There will be no "quick answers" in the investigation of a house explosion which killed a child and left four others injured, a fire chief has said.
Two-year-old George Hinds died in the blast on Mallowdale Avenue in Heysham, Lancashire, in the early hours of Sunday.
Two houses collapsed and a third was seriously damaged.
Assistant chief fire officer Ben Norman said investigators were working in "the most awful conditions".
He said officers were "very much moving to slow time, to methodically work through what is a very, very difficult site".