Police are interrogating eight persons in connection with the failed car bomb attacks on London's West End and Glasgow airport. They were arrested in the UK and Australia.
 This is what is known so far about those who are being held:
Bilal Abdullah: Iraqi doctor Bilal Talal Samad Abdullah was arrested at Glasgow airport on Saturday. He works at the Royal Alexandra Hospital in Paisley as a diabetes specialist. Dr Abdullah qualified in Baghdad in 2004 and first registered as a doctor in the UK in 2006. He was given limited registration by the General Medical Council (GMC) from 5 August 2006 to 11 August 2007.
Limited registration is awarded to recent medical graduates and it allowed him to work in Britain for a year, but in accordance with standard procedure, he could not move jobs during that time and had to be supervised.
An associate of Dr Abdullah, Shiraz Maher, said the arrested man was "very angry about the West". He's actively cheered the deaths of British and American troops in Iraq," Mr Maher said.
The Daily Mail claimed that Dr Abdullah's father ran a private clinic in Baghdad until two years ago when he fled to the town of Irbil in north-east Iraq after being threatened by Shia militants.
Dr Mohammed Asha:  A second doctor being held is Mohammed Asha, 26, who lives in Newcastle-under-Lyme, Staffordshire. Dr Mohammed Asha has a two-year-old son. He was arrested on the M6 motorway in Cheshire on Saturday night.
Dr Asha is of Palestinian descent but grew up in Jordan. Dr Asha's father Jamil told the BBC that his son "never showed any signs of growing militancy" during his three-year stay in Britain and called his arrest a "mistake".
He said they "were in phone contact every week" and that his son had been due to visit on July 12 with his wife and their son. Security officials in Amman said Dr Asha has no previous criminal record in Jordan.
Dr Asha is married with a young son and lives with his family in Sunningdale Grove in Newcastle-under-Lyme. His wife was arrested with him on the M6 and both are being questioned at Paddington Green police station in London.
Marwah Dana Asha: Marwah Dana Asha, the 27-year-old wife of Mohammed Asha, is reported by AFP to be a fellow Palestinian who was trained as a laboratory researcher.  She is the mother of a two-year-old boy. Dr Asha's father told the AFP news agency that his son and his wife had met at school and married in 2004.
According to Jubilee School records, both had "exceptional records, exemplary social conduct and excellent academic results".
Marwah Dana Asha is trained as a laboratory researcher
Dr Mohammed Haneef was arrested in Brisbane Airport. His cousins are Sabeel and Kafeel Ahmed. Kafeel , who suffered burns to 90% of his body has been transferred to a specialist burns unit at Glasgow Royal Infirmary from a hospital in Paisley. He is still critical.
He studied for his PhD in the department of design and technology at Anglia Polytechnic University (now called Anglia Rushkin University) in Cambridge, it is believed.
 An unidentified 28-eyar-old man was arrested in Paisley on Sunday. Media reports say he is a medical student or doctor working at the Royal Alexandra Hospital but officials have not confirmed this.