The UK terror threat has been raised to critical, meaning an attack is expected imminently, after a device was detonated at Parsons Green station at 08:20 yesterday on the eastbound District Line train from Wimbledon.

Twenty-nine people were injured in the attack.

Although Police Scotland said there was no intelligence to suggest there is any specific threat to Scotland, armed police patrols will be increased.

Officers have urged the public to remain alert and report anything suspicious.

Assistant Chief Constable, Bernard Higgins said: “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.”