Citizens can safely return to their homes," Regional Governor Apostolos Tzitzikostas wrote on Twitter.

However, researchers from the University of Gothenburg and the University of Bournemouth decided to take a closer look at the ruins and discovered a lost ancient city near the village of Vlochos.The group, many of them Syrians fleeing the civil war there, live in a nearby former toilet paper factory.They were taken to the Archaeological Museum of Thessaloniki, a listed monument whose permanent exhibitions include masterpieces of ancient Greek art dating from prehistoric times to late antiquity.The area inside the city wall measures over 40 hectares.Just five hours north of Athens archaeologists have discovered a lost ancient Greek city dating back some 2,500 years.The bomb was deactivated by specialists by midday on Sunday local time, and was taken from the site just to the west of central Thessaloniki to a military shooting range to be destroyed.Up to 72,000 residents living within a two-kilometre radius of the bomb site had been asked to leave their homes for local gyms, stadiums and cafes.