Durham Police say they have stepped up patrols across County Durham and Darlington after the UK threat level was raised to critical.
Officers say there is nothing to suggest any specific threat to communities, and are asking people to 'remain calm, but alert'.
The force has also sent a number of officers to assist in Manchester.
We’ve stepped up patrols to provide a visible, reassuring presence. This will remain the case for as long as necessary.
We will continue to review public events due to take place in our area over the coming days.
Durham Constabulary have plans in place for situations like this and currently it is extremely unlikely that members of the public will see military staff on our streets.
If you see anything that causes you concern, then call the anti-terror hotline immediately on 0800 789 321. In an emergency dial 999.”
Durham Cathedral say they are continuing to be vigilant about security following the Manchester attack.
Additional measures have been put in place in response to the current threat level, which has been raised to 'critical.'
In a statement they said:
As a place of worship and hospitality, we offer a warm welcome to all visitors who wish to visit the Cathedral to pray, worship or simply find a quiet space to reflect.
Above all, our thoughts and prayers are with all those affected by the tragic events in Manchester and with those affected by terrorism and conflict throughout the world.
Nearly 1,000 members of the armed forces will be deployed today as part of Operation Temperer.
Home Secretary Amber Rudd confirmed that 984 military personnel will be providing extra security as they take up positions around the country.
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Although some cloud will bubble up through the day, there will still be plenty of strong sunshine.
It will become very warm, although along the coast cool sea-breezes will eventually develop.
Maximum temperature 24 °C.
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Three men have been arrested in connection with the suicide attack on Manchester Arena on Monday, police have announced.
The trio were held in South Manchester, Greater Manchester Police said.
A 23-year-old man was arrested yesterday in connection to the bombing on an Ariana Grande concert.
The attacker, said to be 22-year-old Salman Abedi, died in the blast.
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Some 20 people are in critical conditions and are being treated for "horrific injuries" following the Manchester terror attack, a senior NHS official has said.
Jon Rouse, chief officer of the Greater Manchester Health and Social Care Partnership, confirmed that some people have life-threatening injuries.
Speaking to the BBC Mr Rouse said: "They've been the sort of traumatic injuries that you would expect in terms of the type of device used, the proximity to the people who were injured.
"We're dealing with injuries to major organs, we're dealing with loss of limbs potentially, we're dealing with embedded objects, all the horrific injuries that you would expect from the event that happened."
He continued that the victims were receiving "round-the-clock" treatment.
Of the 59 people injured in the suicide bombing, 12 were children.
Residents of North Yorkshire are being urged to seek support if they have been affected by the Manchester attack.
Julia Mulligan, the North Yorkshire Police and Crime Commissioner, has said: “I’m devastated to hear about the horrific attack that targeted teenagers, children and their families in Manchester, it’s a shocking and senseless loss of life of people who were just out to enjoy themselves."
The Supporting Victims team can be contacted by: