London, Sha'ban 28, 1438, May 24, 2017, SPA -- Prime Minister Theresa May raised Britain's terrorism threat level to the highest level of "critical" on Tuesday. May said the threat level was raised for the first time in more than two years based on intelligence following a preliminary investigation into the attack late Monday at the end of a concert by pop star Ariana Grande in Manchester Arena. Military personnel could be deployed in urban areas to assist police, operating under police command, she added. --SPA 02:59 LOCAL TIME 23:59 GMT www.spa.gov.sa/w412872