One of the two Indian doctors who were detained in Australia in connection with the failed terrorist plots in London [Images] and Scotland has been released.

Australian Federal Police Commissioner Mick Keelty on Wednesday said Mohammed Asif Ali was released without any charge after being questioned.

Keelty said Ali had not committed any crime and was free to go about his business.

Ali and Haneef previously worked in Liverpool and lived together.

Meanwhile, the third Indian doctor detained in Liverpool was identified as a man from Bangalore and related to Dr Muhammed Haneef, whose detention in police custody was extended for two more days in Australia.

The doctor taken into custody last Saturday was identified as 26-year-old Sabeel Ahmed, who was also the classmate of Haneef in Ambedkar medical College in Bangalore.

Ahmed's mother said in Bangalore that he was related to Haneef, who is being interrogated by the Australian police. Both Haneef and Ahmed had worked together in Halton hospital in Cheshire in 2005 and the latter is still working there.

Australian Prime Minister John Howard said in Melbourne that it was important to remember that Haneef had not been charged.

"I must stress that the man has been detained, he has been taken into custody, he has not been charged with any offence," he said.

Howard also said Britain is sending a top police officer to Australia to question Haneef.

Keelty said authorities were granted permission to hold Haneef for another 48 hours without charge and cautioned he may yet be fully cleared of any connection to the terror plots.

Muhammed Haneef and Sabeer Ahmed are among the eight persons -- one in Australia and seven in the UK -- being detained by police in connection with the failed terror plots. All of them are medically trained.