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Memorial service held for IS victim Steven Sotloff

Nearly 1,000 mourners including relatives, friends and politicians, have attended a memorial service in Florida for US journalist Steven Sotloff, who was killed by IS militants.

The Islamic State released a video on Tuesday showing the murder of Mr Sotloff.

He is the second American journalist to be beheaded in two weeks over the group's confrontation with the US over air strikes in Iraq and its foreign policy.

Footage of James Foley being beheaded on August 19 shocked the world.

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Clegg: Countries on frontline must lead IS response

Nick Clegg says British air strikes on Islamic State militants would have to be a part of a "jigsaw of other measures" led by countries in the region.

Nick Clegg says countries on the frontline against IS must lead the response to IS. Credit: Stefan Rousseau/PA Wire

The Deputy Prime Minister told BBC News: "Air strikes on their own - particularly if they are deemed to be air strikes by the West against the rest - don't work.

"We can only act in support of those countries that are on the front line against this terrible menace of Isil - the legitimate government in Baghdad, the legitimate authorities in the Kurdish northern part of Iraq," he said.

Mr Clegg added: "As long as we can work in concert with other countries and in support of other countries, then we should not rule out Britain continuing to play an active role in trying to ... squeeze out of existence this medieval and vile movement."

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