Three construction workers were killed when part of a 19th century building in Alexandroupolis, which they were helping to restore, collapsed, authorities said on Saturday. The accident occurred at 12.30 p.m. on Friday when a section of the roof and a wall of a two-story tobacco factory built in 1898 in the northeastern town gave way. Emergency services arrived on the scene and pulled the three bodies out late on Friday night. The workers, Athanasios Gatidis, 36, Yiannis Goudoulas, 36, and Agathagellos Yiakovidis, 54, were helping to renovate the listed building so it could house the municipal library. After examining the collapsed building, experts from the Evros prefecture decided that the whole structure had to be demolished within 72 hours for safety reasons. However, the process could be delayed as a local prosecutor ordered a thorough investigation of the site as part of a probe into what caused the collapse.