Yemen says it has foiled a major al-Qaeda plot to blow up oil pipelines and seize two of the country’s main ports.
Government spokesman Rajeh Badi said the plans included taking control of the al-Dhaba oil terminal and killing or kidnapping foreign workers.
The authorities have introduced security measures to protect government buildings and other key targets.
Hundreds of armoured vehicles have been deployed in the capital, Sanaa, while the US and UK have withdrawn diplomats.
The US is also reported to be preparing special operations forces for possible strikes against the Yemen-based al-Qaeda in Arabian Peninsula (AQAP).