A powerful aftershock with magnitude 5.9 has caused additional damage in central Greece a day after an earthquake shook hundreds of homes in the same area.
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Authorities say some empty houses, which had been abandoned by residents after suffering damage on Wednesday, collapsed but no injuries were reported.
According to the Athens Geodynamic Institute, the aftershock struck as night fell on Thursday outside the central town of Elasona, some 365 kilometres northwest of the Greek capital.
Local authorities advised people in the area to remain outdoors for a second night.
"We are advising people not to return to their homes in the area near the epicentre," said Efthymios Lekkas, head of the state-run Earthquake Planning and Protection Organization.
"This latest event came from a section of the faultline we had not considered to be active. It surprised us."
The army set up tents in the area on Wednesday after a 6.0-magnitude earthquake jolted the region and was felt as far as Montenegro, some 500 km to the north.
It caused no serious injuries but scores of homes were damaged in several villages near Elasona.
Australian Associated Press