The security forces are reviewing public safety and issuing advice to the public in the South after the bombing at Manchester Arena last night.
People are being advised to go about their ordinary lives, but at the same time to be on alert and to report any suspicious incidents.
The English Football League is urging all football supporters planning to go to the play-offs at Wembley next week to be '...vigilant, stay alert and not be alarmed.'
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A vigil has been held to remember the three victims of the terror attack in Reading.