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MANCHESTER, ENGLAND - Members of the public receive treatment from emergency service staff at Victoria Railway Station close to the Manchester Arena on May 23, 2017 in Manchester, England.  There have been reports of explosions at Manchester Arena where Ariana Grande had performed this evening.  Greater Manchester Police have have confirmed there are fatalities and warned people to stay away from the area. (Photo by Dave Thompson/Getty Images)
MANCHESTER, ENGLAND - Members of the public receive treatment from emergency service staff at Victoria Railway Station close to the Manchester Arena on May 23, 2017 in Manchester, England.  There have been reports of explosions at Manchester Arena where Ariana Grande had performed this evening.  Greater Manchester Police have have confirmed there are fatalities and warned people to stay away from the area. (Photo by Dave Thompson/Getty Images)

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    UK raises threat level to critical

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UK raises threat level to critical

Prime Minister Theresa May says that the UK has raised its threat level to "critical" -- the highest level -- for the first time in a decade. The level suggests intelligence services believe an attack is "imminent." CNN's Brian Todd reports.

UK raises threat level to critical

Prime Minister Theresa May says that the UK has raised its threat level to "critical" -- the highest level -- for the first time in a decade. The level suggests intelligence services believe an attack is "imminent." CNN's Brian Todd reports.