Extra police are out on the streets and at railway stations across the Border region after yesterday's terror attack on a Tube train in West London.
Civil Nuclear Police at Sellafield are also on extra alert after the threat level across the UK was raised to 'critical'.
Armed officers will be on patrol at one of today's biggest events, the Cumbria Pride Festival in Carlisle.
Police Scotland's Assistant Chief Constable Bernard Higgins says his force will also be deploying armed police at key locations and in crowded areas north of the border.
"With the threat level now at Critical, Police Scotland will be increasing our operations to protect the people of Scotland, our businesses and public places.
This will include increasing the number of armed police on patrol across the country. The public should expect to see armed officers on foot patrol at key locations and crowded places across the country.
Please do not be alarmed by the presence of these armed officers. These measures are being taken to increase security at these sites, and to reassure residents, businesses, workers and visitors so they can go about their daily lives as normally as possible.
Along with event organisers, we will also be reviewing all significant events taking place over the next few days and will increase the security footprint around those events where it is deemed appropriate.
We have well-rehearsed plans to respond to major incidents and we will be continuing to work with our partners to address the current heightened threat.
However, there is no intelligence to suggest there is any specific threat to Scotland but I would ask the public to remain alert and report anything suspicious.
Terrorists want to create discord, distrust and fear. The police stand together with all communities in the UK and we will take action against any criminal behaviour, which seeks to undermine society, especially where crimes are motivated by hate. Communities defeat terrorism, which is why we must maintain the strong relationship we have between the public and the police."
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Armed police are patrolling the streets of Cumbria.
This morning two armed officers and a number of unarmed patrols were seen in Carlisle city centre.
The increased presence comes as the UK terror level remains at critical in the wake of Monday's Manchester terror attack.
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Carlisle Cathedral has set up a place where people can light candles and pray for the victims of the Paris terror attacks.
A model of the Eiffel Tower has been placed on a table to inspire people in their reflections.
The remembrance area in the cathedral has been set aside for the three days of national mourning in France.
Carlisle City Council leader, cllr Colin Glover, has led tributes to the people of Paris before a one minute's silence in the city centre this afternoon.
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A 22 year old man has been arrested as part of the investigation into the murder of Constable Ronan Kerr in Northern Ireland last year.
The arrest was made in Milton Keynes by the North West Counter Terrorism Unit. The man, who's from Omagh, has been taken to a police station for questioning.
The Police Service of Northern Ireland says searches carried out earlier today in Cumbria and in Northern Ireland have been completed. Several items have been seized for examination. Police say their inquiries are continuing.
Officers investigating properties in the north of the county.