The police custody of Indian doctor Mohammed Haneef was on Thursday extended by four more days for further questioning in the failed terror plot in London [Images] and Glasgow amid reports that the man who drove the burning jeep in the Glasgow airport attack may also be an Indian doctor.

In a closed court hearing in Brisbane, the Australian Federal Police was given another 96 hours to continue holding Haneef, who has been under detention without charge in Brisbane since Monday.

The detention order was to expire on Thursday night.

Haneef, who was granted consular access, was interrogated by a British counter-terrorism expert.

Haneef is one of the eight persons -- one in Australia and seven in the UK -- being detained by police, and all of them are medically trained.

Meanwhile, there was some confusion on the exact number of Indian doctors who may be linked to the failed terror plots after a British newspaper reported that the Glasgow jeep driver was an Indian doctor and the brother of another doctor Sabeel Ahmed, who is in police detention in London since last Saturday.

The Daily Telegraph said 27-year-old Kafeel Ahmed, who is also being mentioned as Khalid Ahmed, and Sabeel Ahmed are cousins of Haneef. Kafeel is also in police custody.

The Indian high commission in London is still to get a clear picture on the number of Indians linked to the terror plot, but sources said only Haneef and Sabeel are being named.

Media reports also said that Haneef and brothers Sabeel and Kafeel graduated from the Ambedkar Medical college in Bangalore.

Bangalore Police Commissioner Achyut Rao said there was no confirmed link between Sabeel and Khalil.