An illegal cigarette factory has been uncovered in Spain where six foreign workers were found gasping for air before being rescued, authorities said.

Twelve British nationals suspected of running the factory were arrested.

The bunker under horse stables in the southern province of Malaga could produce up to 3,500 counterfeit cigarettes an hour.

It is the first underground counterfeit cigarette factory found in the EU, Europol and Spanish police said.

Six Ukrainian and Lithuanian workers were found struggling to breathe due to a generator designed to pump air into the bunker running out of gas, police said.

Twenty people had been arrested earlier in the day but had not informed police that the workers were still inside. The panicked workers banged and shouted from below as police searched the area.

Officers eventually found the workers and freed them.

Police confiscated 153,000 packs of cigarettes, more than 17 tons of rolling tobacco, 20 kg (44 lbs) of hashish and 144 kg of marijuana.

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