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Yemen says it has foiled an al-Qaeda plot to blow up oil pipelines and seize some of the country's main ports.
Security remains tight - and hundreds of armoured vehicles have been deployed to protect key targets.
Both the US and UK have withdrawn diplomatic staff from Yemen, prompted by intelligence reports of renewed terrorist activity.
Yemeni government spokesman Rajeh Badi said the plot involved blowing up oil pipelines and taking control of certain cities - including two ports in the south, one of which accounts for the bulk of Yemen's oil exports and is where a number of foreign workers are employed.
"There were attempts to control key cities in Yemen like Mukala and Bawzeer," said Mr Badi.
"This would be co-ordinated with attacks by al-Qaeda members on the gas facilities in Shebwa city and the blowing up of the gas pipe in Belhaf city."
Al-Qaeda members dressed as soldiers were to be outside the ports, he said. On a given signal they were to invade the facility and take it over.
Witnesses and local officials in the province of Shabwa said the drone fired at least six missiles at two vehicles in a remote area some 70 km (50 miles) north of the provincial capital, Ataq. Both vehicles were destroyed.
Residents who rushed to the scene found only charred bodies, they said.
At least 20 suspected militants have been killed since July 28,
On Sunday Yemen’s Saba News agency, quoting an unnamed official, said that tribesmen have blown up the pipeline in Wadi Abida, in the province of Marib.
The flow of crude oil has been interrupted as a result of the explosion.
The bomb blast halted the flow of oil along the 320 kilometer pipeline linking the Safer oilfields to the export terminal in the province of Hodeida.
According to the official, the blast is the "second act of sabotage by the same group in 10 days."
The tribesmen are demanding the government to release at least one prisoner.
On June 27, Yemeni officials said an attack was carried out at a pipeline in Marib’s Sarwah area.
Over the past two years, insurgents and tribesmen have repeatedly attacked oil and gas pipelines in Yemen in a bid to win concessions from the central government, causing fuel shortages and slashing export earnings in the impoverished country.