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'Revolution' in Syria = good; Real revolution in Yemen = bad.
Yemen's army has launched an offensive against tribesmen suspected of repeatedly sabotaging an oil pipeline in the country's east, sparking clashes that left 17 people dead, tribal sources say.

The dead included 10 tribesmen and seven soldiers, said the sources, who added the offensive in Marib province's Habab valley, 140 kilometres east of the capital Sanaa, was launched in the early hours of Tuesday and backed by air raids.

The sources said the army was "randomly shelling" the area where some al-Qaeda militants joined tribesmen battling Yemeni troops. Marib is a major al-Qaeda stronghold.

Tribesmen, of whom 18 were also wounded according to the same sources, fought back with rocket-propelled grenades and machine guns, one source said.

According to official figures, lost production because of attacks on the oil pipeline in the east cost the government more than $US1 billion ($A965 million) in 2012, while oil exports fell by 4.5 per cent.

A tribal source told AFP the offensive was targeting prominent figure Salah bin Hussein al-Dammaj, who has allegedly blown up the pipeline several times to pressure the authorities to pay him 100 million riyals ($A465,000) in compensation for land he claims was taken from him in Sanaa.

The 320-kilometre pipeline carries oil from Safer oilfields in Marib to an export terminal on the Red Sea. It carries about 180,000 barrels per day.

Source: Australian Associated Press