The Home Secretary Theresa May has met the head of the MI5 and the Metropolitan Police Assistant Commissioner Cressida Dick to discuss security in light of the attacks in Boston.
Mrs May will be updating Cabinet later.
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Showers continue across some southern and western areas tonight.
Two people are being treated in hospital after an "explosion" in a flat in West Dunbartonshire.
Tom Billings, 22, went missing in Canada in December 2013 during an eight-week trip of North America.