Detectives raided two hospitals in Western Australia today in connection with the failed terrorist plot to cause death and destruction on London and Glasgow.

Executing a number of search warrants police seized computer files and questioned four more English emigrant doctors who are known to each other.

Australian Federal Police (AFP) Commissioner Mick Keelty said links to the UK were “becoming more concrete” as police began to inspect some 31,000 computer files seized in the raids within Perth and the mining town of Kalgoorlie.

He said warrants at Kalgoorlie and Royal Perth hospitals in Western Australia were among four search warrants executed in relation to the bombings.

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Eight suspects have been held by anti-terror police investigating the failed car bomb attacks in Glasgow and London

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• Biting back at terror suspects

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• Search for the thread linking bomb suspects

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Mr Keelty said that inquiries had now extended to a third state with investigations involving an unnamed doctor in New Soluth Wales, Australia’s most populous state.

“There are a number of people now being interviewed as part of this investigation, it doesn’t mean they’re all suspects but it is quite a complex investigation and the links to the UK are becoming more concrete,” said Mr Keelty.

Confirming that another four migrant doctors – believed to be Indian – who had worked in Britain had been questioned today, Mr Keelty said: “What we want to do is just re-assure people that it is not an investigation into medical practitioners, per se.

“It’s an investigation in support of the investigation by the London Metropolitan police counter-terrorism command.”

Philip Ruddock, Australia’s Attorney-General, said a number of items have been taken by police for further examination, including telephones and laptop computers. No dangerous materials have been seized.

Mr Ruddock said: “This is not about doctors. A precise (description) is that they are people who are of the same nationality here in Australia.”

He said that the people being interviewed by police are known to each other.

In Britain five men and a woman are still being questioned at Paddington Green police station in West London. Police have until the weekend to charge or release them or seek an extension.

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