Scotland Yard said they are "very concerned" for the safety of three sisters - Shaventelle Downer, five, and identical twins Shania and Shamina Rose, 12 - who went missing from a day centre in London today.
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It will be a cloudy and at times damp morning across much of the UK, apart from the far west where it will be dry and bright.
Barack Obama has returned to the political spotlight, campaigning for Democratic candidates ahead of upcoming elections.
The prime minister said there was a "clear and urgent imperative" to give new impetus to stalled negotiations.