Sabeel's brother Kafeel, who drove the blazing jeep into the Glasgow airport, is reported to have left a suicide note amid claims by a media report that he had links with a senior Al Qaeda operative.
"A suicide note was found at the house near Glasgow where Ahmed had been staying since April," a security source said.
The police also searched the home of the second Indian, Mohammed Asif Ali who was questioned by police but released.
The Australian Federal Police said it released another five Indian doctors after quizzing on the grounds that they would be available for further questioning as Attorney General Philip Roddock observed that Haneef was being detained as he was intent on leaving Australia on a one-way ticket.
The AFP have been given time till tomorrow night to hold Haneef, who is also facing a probe for possible links to an underground network of radical Islamist doctors in Australia funding overseas terrorist activities.
Haneef's solicitor Peter Russo expressed frustration that AFP hadn't stated the case against his client amid reports that one of its police officers may travel to India for investigations. With no scenario ruled out, flight schools will be also contacted to see if Haneef was taking flying lessons, a media report said.
In London, a Scotland Yard spokesman said a magistrate had granted an extra week to hold and question the five suspects that included Indian doctor Sabeel Ahmed.
As Britain grapples with terrorism, the new Security and counter-terrorism minister Sir Alan West said the battle against this scourge will last 15 years.