The UK terror threat level has been raised to the highest level of "critical", meaning further attacks may be imminent, Theresa May has said.
Raising the level to critical means that military personnel could be deployed to support armed police officers - part of a plan known as Operation Temperer.
In the aftermath of the devastating bombing in Manchester on Monday night, investigators will be focused on one question in particular: did Salman Abedi, the suspected bomber, act alone?
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