Military personnels of a Greek military bomb disposal squad stand at the site of a World War II bomb in suburb of Thessaloniki, Greece, on Feb. 12, 2017, ahead of an operation to defuse the bomb. Nearly 72,000 residents in the northern Greek city of Thessaloniki were evacuated Sunday morning ahead of a massive operation to defuse a WWII bomb, local authorities have said. (Xinhua/Vasilis Ververidis)