Indian engineer Kafeel Ahmed, who suffered 90 per cent burns following an attempt to drive a blazing vehicle into the Glasgow airport, has little chance of survival, doctors have said.

The 27-year-old, believed to be at the centre of the failed terror plot, has been fighting for his life at a Glasgow hospital for 12 days now.

Ahmed is heavily sedated and might suffer organ failure, doctors attending to him said on condition of anonymity. He has not been arrested so far and is undergoing treatment for third degree burns in the hospital under strict police vigil.

Investigators are probing into the background of the aeronautical engineer, piecing together his work history and scouring phone records to pinpoint his associates and movements, sources said.

So far only one person, Bilal Abdullah, a 27-year-old doctor born in Britain and raised in Iraq, and who was a passenger in the jeep driven by Kafeel, has been arrested and charged with conspiracy to carry out the car bombings in London [Images] and Glasgow.

British authorities have also frozen Abdullah's assets. Kafeel's brother Sabeel Ahmed, 26, was arrested in Liverpool and is being questioned by the London police.