A woman held over failed car bombings in London and Glasgow airport has been freed without charge, police have said.
A jeep was driven into the entrance of Glasgow Airport on 30 June
Marwa Asha, 27, from Staffordshire, was arrested with her husband, Dr Mohammed Asha, 26, on 30 June. Dr Asha remains in custody at a London police station.
One man has been charged over the suspected attacks and four others are still in custody.
Meanwhile, Australian police have three more days to question another suspect, Dr Mohammed Haneef, 27.
Police picked up Dr Haneef, who is an Indian national, at Brisbane airport on 2 July after a tip-off from British police.
Under anti-terrorism laws, Australian detectives can question him for another 12 hours over the next three days. They dropped a request to extend his detention.
Iraqi doctor Bilal Abdullah, 27, is the only person to be charged over the failed bombings.
Dr Abdullah was remanded in custody on Saturday at Westminster Magistrates' Court, London. He is accused of conspiracy to cause explosions.
Police are continuing to question Dr Asha, from Newcastle-under-Lyme, and three other men at London's Paddington Green station.
Officers have until 14 July to question Dr Asha and Dr Sabeel Ahmed, 26, who is from India and works at Halton Hospital in Cheshire. Dr Ahmed was detained in Liverpool.
Two other men, aged 25 and 28, and thought to be medical students or doctors, were arrested at the Royal Alexandra Hospital, Paisley. They can be held by police until 15 July.
Another suspect, Kafeel Ahmed, 27, from Bangalore, India, is in a specialist burns unit at Glasgow Royal Infirmary under armed guard.
He was arrested along with Dr Abdullah at Glasgow airport, after a Jeep was driven into the doors of the main terminal building and burst into flames on 30 June.
Kafeel Ahmed and Sabeel Ahmed are brothers, and Dr Haneef is their cousin.
The attack happened a day after two cars containing petrol, gas cylinders and nails were found in central London.
Dr Abdullah, charged under the 1883 Explosive Substances Act, faces a maximum sentence of life imprisonment if he is convicted.
He is due to appear at the Old Bailey on 27 July for an initial hearing.