Hours after police announced the arrests of two more people in the Glasgow area, officials said an eighth suspect was detained "abroad by local authorities" Monday.

The unidentified driver of the Jeep was being treated for serious burns at Royal Alexandra Hospital in Glasgow, where he was under arrest by armed police. Bomb experts carried out a second controlled explosion on a car at the hospital Monday, after a similar blast Sunday. Police said the car was linked to the investigation but no explosives had been found.

Authorities identified Bilal Abdulla, an Iraqi doctor who worked at the Glasgow hospital, as the other man arrested at the airport and said he was being held at a Glasgow police station.