Police in Australia have seized new evidence and questioned five more doctors over last week's failed car bomb attacks in the UK.
Police have been given more time to question Dr Haneef
Computers and other materials were taken from two Western Australian hospitals, one in Perth and one in the Outback mining town of Kalgoorlie.
Police said the doctors questioned had not been arrested.
The raids came as Australian police were given more time to question a relative of two men held in the UK.
Mohammed Haneef was held at Brisbane airport in Queensland as he tried to leave for India on Monday. He will be questioned by a team that includes a senior counter-terrorism officer from Scotland Yard.
Eight people, all linked to Britain's National Health Service, have been arrested over the failed attacks in Glasgow and London.
Australia's federal police chief Mick Keelty said the new people quizzed were "migrant doctors, of similar nationality and background to the other doctors that are being questioned".
He said they had worked in the UK's National Health Service and had come into contact with Dr Haneef.
Four doctors were questioned and subsequently released in Western Australia. One has been questioned in a third state - New South Wales.
"There are a number of people now being interviewed as part of this investigation, it doesn't mean that they're all suspects but it is quite a complex investigation and the links to the UK are becoming more concrete," Mr Keelty said.
"The people we are trying to talk to at the moment... we are trying to gather evidence or information about the network, about who is linked to who and whether in fact anybody has committed any criminal offence," he said.
Mohammed Haneef is the relative of two of the suspects being held in Britain - Kafeel Ahmed, who was badly burned during the attack on Glasgow airport, and his brother, Sabeel, who was arrested in Liverpool.
30 June Dr Kafeel Ahmed and Dr Bilal Abdullah arrested at Glasgow airport after burning car driven into doors of main terminal
30 June Dr Mohammed Asha, 26, and his wife Dana Asha, 27, arrested on the M6 near Sandbach, Cheshire
30 June/1 July Dr Sabeel Ahmed (brother of Kafeel), 26, arrested near Liverpool's Lime Street station
1 July A 28-year-old man and a 25-year-old man, thought to be medical students or doctors from Saudi Arabia, arrested in Paisley
2 July Dr Mohammed Haneef, 27, detained in Australia, and a second doctor is questioned
3 July Second doctor questioned in Australia is released without charge
4 July Police search house in Cambridge
5 July Dr Haneef detained for further 96 hours
Kafeel Ahmed has been transferred from the Royal Alexandra hospital in Paisley to a specialist burns unit at Glasgow Royal Infirmary, health officials said.
Mr Ahmed, who has been kept under armed guard, is still in a critical condition.
It has emerged that the Ahmed brothers applied to work as doctors in Western Australia on numerous occasions but were rejected.
"We checked their qualifications and references and decided that they did not meet the standard required," Geoff Dobb, the president of the Australian Medical Association in Western Australia, told the Associated Press.
"It had nothing to do with suspicions of any terrorist associations," he said.
Dr Haneef trained as a doctor in his native India, graduated from the Rajiv Gandhi University of Health Sciences in Bangalore in 2002.
He arrived in Australia in September 2006 following a period spent in Liverpool.
He took a job as a registrar at the Gold Coast Hospital.
A police spokesman said they were still analysing some 18,000 files on the Indian doctor's laptop.
Meanwhile, British police on Thursday searched an address in Cambridge as part of their investigation.
It has emerged that four of the suspects were in Cambridge in 2005 and that they knew each other.
Dr Ahmed and Dr Bilal Abdullah, both arrested at Glasgow airport after a burning car was driven into doors of main terminal, were "best mates", their associate in Cambridge, Shiraz Maher, has told the BBC.
Dr Abdullah was a resident in the city in 2001 and again in 2005.
It has also emerged that Dr Ahmed worked and studied at Queen's University in Belfast, Northern Ireland, for almost three years.
Dr Ahmed was moved under armed guard on Friday to a specialist burns unit at the Glasgow Royal hospital.