British Prime Minister Theresa May said on Thursday the terror threat level in the U.K. will remain at critical, following a suicide bombing that killed 22 at an Ariana Grande concert on Monday.
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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 center, will remain at critical and the public should remain vigilant," May said following a meeting of the government's emergency response committee.
Police are hunting for a possible bomb-maker after the 22-year-old attacker, British-born Salman Abedi, detonated a sophisticated device at a concert venue packed with children. In addition to the 22 people who died, 64 were injured.
A reported suspicious package in Manchester which British army bomb disposal experts investigated has been deemed safe, police said Thursday.
May also said on Thursday she would "make clear" to U.S. President Donald Trump that intelligence shared between the two countries must remain secure, the Press Association reported.
British ministers and security chiefs have been dismayed by leaks in the U.S. media which police fear could hinder a hunt for a possible bomb-maker still at large. Local media said the U.K. government is "furious" over the leaks of details about the investigation into a blast which killed 22 at an Ariana Grande concert on Monday.