All eight people arrested in connection with car bomb attacks in London and Glasgow have links to Britain's National Health Service.
Seven are believed to be doctors or trainee doctors while the one woman under arrest is a trained laboratory researcher.
A man arrested at Brisbane Airport last night was identified as Dr Mohammed Haneef (27), who once worked at hospitals in Cheshire.
Dr Haneef was arrested at Brisbane Airport where he had been due to catch a flight. One more man, also a doctor with links to Cheshire, is being questioned by police in Australia. He has not been arrested.
The doctor was named in Australian newspaper reports as Mohammed Asif Ali, a near neighbour of Dr Haneef. Details of the link between the arrested men and women and the medical profession sent shockwaves through the health industry.
The investigation into the car bomb attacks at Glasgow Airport and in the West End of London continued to move quickly.
Three suspects arrested in Scotland, Dr Bilal Abdulla and two trainee doctors, were transferred to Paddington Green police station in London. It emerged that Dr Abdulla visited Glasgow Airport at least once by taxi before allegedly attacking it in a burning Jeep on Saturday.
Two men were arrested under anti-terrorism laws at an industrial estate in Blackburn, Lancashire as police reportedly investigated the suspicious sale of gas canisters. Police sources said no link had yet been found with the London-Glasgow investigation.
Police in Glasgow are investigating a possible sighting of the Jeep used in the airport attack at West Skelston Services in Heathhall, Dumfries, days before the attack.
Dr Haneef, who is working as a registrar at the Gold Coast Hospital, was detained while trying to board a plane to India with a one-way ticket. He is one of two doctors under arrest who are linked to the Halton Hospital in Runcorn. The second doctor is a 26-year-old man arrested in the Lime Street area of Liverpool on Saturday.
Doctors from the Royal Alexandra Hospital in Paisley, Scotland, and the University Hospital of North Staffordshire in Stoke-on-Trent have also been arrested. Two trainee doctors were arrested at the Royal Alexandra Hospital where a number of searches and controlled explosions have been carried out.
Dr Mohammed Asha (26), who was arrested with his wife, Marwa Asha (26), a laboratory researcher, on the M6 motorway, worked at the Stoke-on-Trent hospital.
One man who was critically injured in the car bomb attack on Glasgow Airport is being treated at the Royal Alexandra Hospital. He is also understood to be a doctor.
The attacks pose a stern test for Prime Minister Gordon Brown, who has come under some pressure to withdraw British troops from Iraq. Britain has seen a marked increase in terrorism-related plots since the September 11th strikes on the United States and its decision to join US forces in invading Iraq in 2003.
Muslim leaders praised the government for its "calm and reassuring tone" in handling the crisis and said they recognised there was a problem of extremism in their community. But fears of a backlash against Muslims in Scotland rose after attackers rammed a car into an Asian-owned shop in Glasgow and set it ablaze.