Suffolk Police said they are treating the deaths of three children at a house in Lowestoft as suspicious.
They are waiting for the results of post-mortem examinations due to take place today.
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England have been beaten by nine wickets against Pakistan in the first Test at Lord's.
Mayor of London Sadiq Khan is backing the scheme.
Sunday will be a fine day across much of Scotland and northern England, with much less coastal mist and low cloud than yesterday.