The investigation into Mohamed Haneef, who was detained for three weeks in connection with the failed British car bombings and then released, was far from over, said Australian Federal Police Commissioner Mick Keelty.

Defending the police handling of the case, he denied that the investigation had been bungled.

"At the moment it is quite annoying that people are saying this is a bungled investigation," Keelty told reporters. "It is not bungled at all. It is continuing.

“It's still potentially possible that a brief of evidence will be submitted against Dr Haneef."

Haneef's lawyer, Peter Russo, who travelled to India with the doctor after he was freed at the weekend, was outraged by the Keelty's remarks.

"For crying out loud, it was his information that the director (of public prosecutions) relied on not to proceed with the matter," Russo told Nine Network television.

The 27-year-old Haneef, who had been working at a state hospital in Australia, was charged with providing "reckless" support to a terror group in connection with June's failed car bombings in London and Glasgow.

The case against Haneef centred on a mobile phone SIM card found in the possession of a second cousin of his who has been implicated in the attacks.

Haneef said he had merely given the card away before moving to Australia to take up a hospital job.

The case became a political issue after Immigration Minister Kevin Andrews revoked Haneef's visa even though he was granted bail by a court and refused to restore it after the charges were finally dropped.

Critics accused the government of trampling on Haneef's rights in an attempt to appear tough on terrorism.