ATHENS, Greece—Fearful of returning to their homes, thousands of people in central Greece were spending the night outdoors late Wednesday after a powerful earthquake, felt across the region, damaged homes and public buildings. The shallow, magnitude-6.0 quake struck near the central city of Larissa. One man was hurt by falling debris but no serious injuries were reported. Officials reported structural damage, mainly to old houses and buildings that saw walls collapse or crack. One of them was a primary school, stone-built in 1938, in the quake-hit village of Damasi where 63 students were attending classes. “The teachers kept their cool and the pupils stuck to the emergency drill, and everyone got out okay,” headmaster Grigoris Letsios said while on a video call with Greek Prime Minister Kyriakos Mitsotakis. “The building will be condemned now…We’ll need a new school.” The army set up tents and meal counters at a nearby soccer …