Avon and Somerset Police responded to the news the terror threat had been lowered after Prime Minister Theresa made a statement this morning (May 27).
The change indicates an attack is highly likely but not imminently expected.
Police hunting a suspected network behind Salman Abedi, the bomber who killed 22 people on Monday night, said they had made two further arrests overnight and that they had a greater understanding of how his device was made. The authorities called on all citizens to remain vigilant, and report any suspicions on potential threats to security to the Royal Gibraltar Police.
Greater Manchester mayor Andy Burnham has said police cuts must be halted following the attack - and claimed the public would be willing to pay more to boost officer numbers.
It had been set at critical in the aftermath of the Manchester bombing.
A "large part" of the terror network is said to have been apprehended.
While police and politicians have praised communities in Manchester for their reaction to the bombing, Greater Manchester Police Chief Constable said there had been a rise in reported hate crimes, from an average of 28 to 56 incidents on Wednesday.
As well as killing 22 people, including seven children, Monday's blast injured 116 with 63 still in hospital and 20 in critical care, health officials said.More news: Bahrain, Egypt block Al-Jazeera websites amid Qatar dispute
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Overnight, officers performed a controlled explosion at a property in Cheetham Hill.
The threat assessment has returned to the level it was at prior to the Manchester attack. A 34-year-old woman and 16-year-old boy who were also arrested have been released without charge.
Britain's senior-most counter-terrorism officer, Mark Rowley, had said that Scotland Yard had reviewed security at more than 1,300 events across the country and people could be "100 per cent confident" they were doing everything possible to protect them.
Abedi was known to United Kingdom security services, but his risk to the public remained "subject to review", according to reports.
Security is being increased at football cup finals at Wembley Stadium in London and the Great Manchester Run.
"Whatever events you are going to - whether you are going shopping or to sporting events or music events, I'd encourage the public to carry on".
Soldiers deployed to support the police will be stood down on Monday night, at the close of the bank holiday weekend.
This is published unedited from the PTI feed.