'Same Men Behind Attacks'
The attempted attacks on London's West End and Glasgow airport were allegedly carried out by the same men, Sky sources say.
Sky's Foreign Affairs editor, Tim Marshall, said the two allegedly planted the car bombs in central London before heading to Scotland.
"We have had it confirmed by sources that the two men who attempted to bomb London, it would appear, are the same two people who allegedly attempted to bomb Glasgow airport," said Marshall.
"In other words after that failed attempt they quickly went up to Glasgow and arranged this.
"I also understand that Scotland Yard were pretty much on their trail already."
Marshall said police were also already watching one of the eight arrested by police investigating the two bomb plots.
"The domestic security services were already aware of one of those arrested," he said.
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"It's not that they were watching someone who was about to bomb the UK and missed them - it was more that a couple of people under arrest that led them to other names and one of those names was already someone who was being watched."
In another development, a second man alleged to have been in the flaming jeep driven into Glasgow airport on Saturday was named by Sky sources as Dr Khalid Ahmed.
He is being treated for severe burns at Royal Alexandra Hospital in Paisley, Glasgow.
The other man in the vehicle was named yesterday as Dr Bilal Abdulla, who worked as a locum at the hospital.
He is being quizzed at Paddington Green police station in London.
Police investigating the failed terror attacks believe they have their key suspects. But they stress their inquiries are far from over and say Britain is likely to remain on a critical level of terror alert for some time.
A total of eight people are being held in connection with the failed bombings - the latest an Indian doctor arrested in Australia.
Seven of those eight are believed to be doctors or trainee doctors, while the one woman under arrest is a trained laboratory researcher.
The Indian doctor, Mohammed Haneef, was detained at Brisbane International airport last night at the request of the British authorities.
According to reports, the 27-year-old had a one-way ticket to Pakistan.
Haneef had been working at the Gold Coast Hospital in east Queensland as a registrar from September 2006. Before moving to Australia, he lived in Liverpool.
In other developments, it has been claimed the gas canisters used in the car bombs were bought at a branch of B&Q at Paisley near Glasgow.
There have also been delays to flights at Heathrow's Terminal 4 after a suspicous bag was identified just before midday.
The terminal was partially evacuated and thousands of holidaymakers had to wait outside the building, at times in heavy rain.
Earlier controlled explosions were carried out on a car outside a mosque in Glasgow. Police say the mosque, in Forth Street, is not connected to the terror investigation.
The terror alert began on Friday when two car bombs were found and defused in central London.
Then on Saturday afternoon a flaming jeep was driven into a terminal building at Glasgow airport.
:: Anyone with information is asked to call the anti-terror hotline on 0800 789 321.
New Scotland Yard, the headquarters of the Metropolitan Police Force
A suspicious bag has undergone a controlled explosion outside a London Underground station, as has a car outside a mosque in Glasgow, Scotland.

These police actions come in the wake of failed terror attacks involving car bombs in London and at Glasgow International Airport on 29th and 30th June.  

The terror threat level in the UK remains ''critical'', indicating that an attack could be expected imminently and high security is in evidence on mass transport routes, while the police continue their investigations.  Earlier this morning, a controlled explosion took place on a suspicious package discovered outside Hammersmith Station on the London Underground system. The scare led to the closure of Hammersmith and Barons Court stations for one hour. 

Two other stations, Tower Hill and East Ham, were closed in similar circumstances. All four stations have now been reopened.

Sky news reports that three controlled explosions took place on a car outside a mosque in Glasgow, in order to allow police to gain entry to it. The mosque itself is not being linked to the terror attacks.

The Muslim Council of Britain has condemned the attacks, and has urged Muslims throughout the country to assist in police investigations.

The police force is continuing its investigations throughout the country, with an open appeal to the country for vigilance in reporting anything suspicious.