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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A one minute silence has been held at the Queen's Garden Party in memory of the 22 people killed and 59 injured in the Manchester attack.
Mancunians have come together in defiance after a suicide bomber killed 22 people at a concert.
Extra armed police will be deployed to Wembley and Twickenham this weekend, police have confirmed.