Addressing the Australian parliament, Cameron praised Australia's tough stance on the issue of foreign fighters joining IS extremists in Iraq and Syria and foreshadowed his own new counter-terror legislation, such as banning extremist preachers, to be introduced in Britain, much of which matches Australia's plans.

But he said a "new pressing challenge" was getting IS material wiped from internet, the Canberra Times reported."There is a role for government in that, we must not allow the internet to be ungoverned space but there is a role for the internet companies too," Cameron told MPs and senators in Canberra.

He said he expected internet companies to live up to their "social responsibilities" and said, while progress had been made, there was more to do.

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