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What initially began as a civil disobedience campaign soon evolved into a widespread insurgency involving pro-democracy and ethnic rebel groups - which eventually sparked an all-out civil war.

Exhausted, broke and heavily in debt to the United States, Britain told the US that it could no longer continue its support for the Greek government forces that were fighting an armed Communist insurgency.

The group has waged a brutal insurgency against Somalia's government for nearly 20 years.

The disappearances in the province are widely believed to be part of Islamabad's strategy to crush the insurgency - but also to suppress dissent, weaken nationalist sentiment and support for an independent Balochistan.

The PKK - or Kurdistan Workers' Party - has waged an insurgency since 1984, and is proscribed as a terrorist group in Turkey, the EU, UK and US.