A soldier and an armed policeman pass Big Ben in London, Britain May 24, 2017. [Photo/Agencies]

LONDON - British Prime Minister Theresa May said on Thursday the terror threat level will remain at critical, following a suicide bombing at a concert hall in Manchester on Monday.

The threat level was raised to critical, its highest level, on Tuesday, for the first time in 10 years.

"The threat level, as assessed by the independent joint terrorism analysis centre, will remain at critical and the public should remain vigilant," May said following a meeting of the government's emergency response committee.

Agencies