Greek customs workers say they’ll hold new, 48-hour rolling strikes that will slow imports and exports.
Workers are protesting government austerity measures designed to pull Greece out of a debt crisis.
The Thursday announcement comes on what was supposed to be the last day of a three-day strike.
Fuel supplies in particular are already beginning to run short.
The workers’ main union called three 48-hour rolling strikes that will close customs offices until next Wednesday, when more Greek workers across the country will walk off the job in a general strike.