Breaking: UK raises terror threat level to "critical," expecting imminent attack

The UK’s terror threat level has been raised to critical – meaning an attack is expected imminently – after 22 people were killed by a suicide bomber in Manchester.

Prime Minister Theresa May made the announcement after a meeting of Cobra, the government’s crisis response committee, on Tuesday evening.

The terror threat level had been severe – meaning an attack was highly likely – since 2014.