Federal Police Commissioner Mick Keelty said four Indian doctors had been interviewed and released, while another Indian doctor in New South Wales state was also being looked at in an investigation now spanning the country.On Thursday (July 5) a court judge in Queensland granted Australian police and a senior British counter-terrorism officer an extra 96 hours to question Mohamed Haneef, detained in Brisbane on Monday as he tried to leave the country, under anti-terrorism laws.Keelty said no one had yet been charged, describing the investigation as difficult and complex, spanning three Australian states and internationally. But any prosecutions would occur in Britain, he said, meaning Haneef was likely to be extradited if police laid charges against him.