Soldiers opened fire on a vehicle that was speeding towards a gas pumping station, 80 kilometres northwest of Belhaf export terminal on the Gulf of Aden, killing the driver, said the army official.
"The bomb-laden vehicle was driven by an Al-Qaeda suicide bomber," he said.
Gunmen also traded fire with soldiers near another pumping station, 10 kilometres to the north of the other station, the official added without giving any casualty figures.
Repeated attacks on gas pipelines feeding Belhaf terminal have forced the suspension of exports for weeks.
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Saboteurs have regularly targeted gas and oil pipelines in the impoverished Arabian Peninsula nation, which relies on its modest energy exports as a main source of revenue.
The attacks, blamed on tribesmen seeking to barter with the authorities or Al-Qaeda, have become more frequent in the wake of a 2011 uprising that forced out veteran strongman Ali Abdullah Saleh.