Archaeologists have uncovered a second-century building with mosaics and frescoes near the Colosseum that may have been barracks used by ancient ​Roman firefighters, the city’s archaeological office said on Wednesday. The mosaic’s ​design closely resembles one previously discovered in a firefighters’ barracks in Ostia, the ancient port of Rome, about 30 km (19 miles) from the capital, the archaeological office said. This ​suggests the building may have belonged to the nearby barracks of ​the Fifth Cohort of the Vigiles, the firefighters of ancient Rome, the office, known ‌as ⁠the superintendency, noted. Under the Roman Empire, the Vigiles were responsible for ​firefighting and maintaining ​public order at ⁠night. Their barracks next to the building in Villa Celimontana used water from a nearby aqueduct.