Manchester attack: UK terror threat level raised to 'critical,' another attack may be imminent

British Prime Minister Theresa May announced Tuesday that the country’s terror threat level has been raised to its highest level based on evidence gathered during the investigation of the deadly attack at a Manchester Ariana Grande concert, signifying that another attack may be imminent. "The threat level should be increased, for the time being, from severe to critical," May said, adding the assessment is "a further attack may be imminent." -- More...