Police in northern Greece say they have arrested six men accused of using dynamite to search for buried ancient gold at a protected archaeological area.

Authorities said Thursday that the four Greek and two Albanian men were arrested Wednesday after police discovered a 12-meter (40-foot) tunnel blasted into the side of a mountain near the city of Kavala, 700 kilometres (435 miles) north of Athens.

The tunnel, with support columns and a construction track, was first started in 2008, according to local police, who said the suspects would be charged with illegal excavation, illegal use and possession of explosives, and violating archaeological protection laws....