Extra police - some armed - will be on the streets of Cumbria as the county responds to the heightened terror threat.

It comes after the UK's terror threat was raised to critical - the highest level - following yesterday's bombing on the London Underground.

The device was detonated on a train at Parsons Green station.

Transport for London said that the station re-opened in the early hours of this morning.

Hundreds of people are expected to gather in Carlisle city centre today for the Cumbria Pride event, and Inspector Chris Wright, of Cumbria police, said that extra officers will be in place across the county.

He said: "The terror threat has been raised to critical and so along with the rest of the country, there will be extra provision in place and a higher police presence.

"Like there was a little while ago, there will be some armed officers on duty as well, to reassure members of the public."

With regards to yesterday's attack, in a statement outside Scotland Yard, Mark Rowley - the UK's most senior anti-terror police officer - said: "Somebody has planted an improvised explosive device on the Tube - we have to be open-minded at this stage about him and about potential associates."

He said detectives were only aware of one device and refused to be drawn on details of the suspects because of the "covert" nature of the operation.

Mr Rowley said detectives have spoken to tens of witnesses, taken a large number of calls to the anti-terror hotline from members of the public, and have so far received 77 images and videos taken at the scene.

He added: "Meanwhile, the improvised explosive device on the train, the remnants of it, have now been made safe and they've been taken away for specialist examination by forensic scientists.

"So whilst we chase down the suspects, as the public would expect, we are strengthening our policing resources on the streets of London and across the country whilst continuing the investigation.

"I have asked Government ministers earlier on for permission to use members of the military to free up extra police resources.

"What that gives me and my team is an extra thousand armed police officers, largely from Civil Nuclear Constabulary and Ministry of Defence police.

"We are working through all of those lines of inquiry, we are making really good progress on that investigation.

"I've had a very detailed briefing on the device, it's components and how it works, I think to put that information out publicly at the moment would be inappropriate given it's part of the investigation."