BBC: Manchester attack: UK threat level raised to highest
The UK terror threat level has been raised to its highest level of "critical", meaning further attacks may be imminent, Theresa May has said.
The move came after investigators were unable to rule out whether Manchester bombing suspect Salman Abedi acted alone, the prime minister said.
Military personnel will now be deployed to protect key sites.
Twenty-two people were killed and 59 injured when a suicide bomber attacked concert-goers at Manchester Arena.
The prime minister also confirmed the government had triggered "Operation Temperer", a long-standing emergency plan to put soldiers into key public locations to support armed police in protecting the public.
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