A burning car was driven into a building at Glasgow's airport

The men, aged 28 and 25, had been arrested by Strathclyde Police at the residences of the Royal Alexandra Hospital in Paisley on 2 July.

Three people have been charged so far in connection with the failed attacks.

An inquiry was launched after two cars with petrol, nails and gas cylinders were found in London on 29 June.

A day later, a burning car loaded with gas cylinders was driven into the main terminal building at Glasgow's international airport.

Three charged

The two men were being held at London's high-security Paddington Green police station.

On 6 July Iraqi doctor Bilal Talal Samad Abdullah was charged with conspiracy to cause explosions. He was arrested at Glasgow Airport following the failed car bombing there.

On Saturday Mohammed Haneef, a 27-year-old Indian doctor, was charged by Australian police with providing "reckless support" to a terrorist organisation.

The doctor, who has denied having any involvement in the alleged attacks, was stopped at Brisbane airport on 2 July as he tried to leave for India.

He is alleged to have provided the mobile phone SIM card to his second cousins Sabeel and Kafeel Ahmed.

Police guard

Dr Sabeel Ahmed, 26, of Liverpool, was charged on Saturday under the Terrorism Act.

The Indian-born doctor, arrested on 30 June, is accused under Section 38(B) of the Terrorism Act 2000 that he had information which he "knew or believed may be of material assistance in preventing the commission by another of an act of terrorism".

He will appear at City of Westminster Magistrates' Court in London on Monday.

Dr Mohammed Asha, 26, of Newcastle-under-Lyme, Staffordshire, who was arrested on 30 June, remains in custody at Paddington Green police station.

Police were granted a further seven days to question him on Saturday.