What the “critical” UK terrorist threat level means

What the “critical” UK terrorist threat level means
- What does that mean? It doesn't mean, as per some reports, that an attack is believed to be or is definitely imminent, but that one could be imminent.
It suggests that the security services believe that Salman Abedi, was not a lone operator but part of a wider cell that is still at large and may be planning further attacks. As the BBC's Dominic Casciani explains, one reason why attacks of this sort are rare is that they are hard to do without help, which can raise suspicions among counterterrorism officials or bring would-be perpetrators into contact with people who are already being monitored by the security services.

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