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Police in Manchester have arrested two men in relation to the terror attack at Manchester Arena on Monday evening, bringing the total number of people in UK custody to eight.
One of the arrests was made after officers from Greater Manchester Police searched an address in the Withington area of the city on Thursday morning.
Good Morning Britain Correspondent Juliet Dunlop said: "It's becoming ever more clear this is a highly complex, fast-moving police investigation.
"In the last 48 hours a string of arrests have been made [and] a controlled explosion carried out [in Moss Side, Manchester]."
The efforts of a taxi driver from Keswick have made one of the heartwarming stories to come out of the terror attacks in Manchester.
Alastair Quinn was a lifeline for a mother from Renwick, near Penrith, allowing her 19-year-old son to get home to safety.
Fiona Marley Paterson went to meet him:
The Army will arrive at Sellafield nuclear plant this afternoon to provide additional security in response to the national 'critical' terror threat.
Armed troops are being deployed to guard "key locations" across the UK, after the prime minister raised the threat level to 'critical', putting Operation Temperer into action.
Armed officers from the Civil Nuclear Constabulary, which polices nuclear sites including Sellafield, are being redeployed to support other forces across the UK.
In an exclusive interview with ITV Border, Sellafield's Director of Security told us:
The organisation which polices nuclear sites, including Sellafield in west Cumbria, has redeployed some of it's armed officers to support other forces across the UK.
It's part of Operation Temperer - where armed forces aren being sent out onto the streets and to guard major sites and events, after the terror threat level was raised to 'critical' in the wake of the Manchester suicide bombing.
Vigils are being held at the University of Cumbria today, to remember the victims of the Manchester terrorist attack.
The ceremonies run from 1.30pm to 2.30pm, at the Fusehill Street campus chapel.
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A minute's silence will be observed at 11am on Thursday in remembrance of those who lost their lives in the Manchester Arena attack.
Dr Theo Weston was called to the scene at the Manchester Arena, describing it as the worst incident he's ever attended.