ISTANBUL - A magnitude-6.1 earthquake struck northwest Turkey during Wednesday's early hours, injuring at least 50 people.
The shallow tremor struck about 170 kilometres east of Istanbul, the country's largest city, where it was strongly felt.
National authorities said the quake was at a magnitude of 5.9 -- lower than the 6.1 given by the US Geological Survey -- and its epicentre was in Duzce province's Golyaka district, though it also shook other nearby cities.
Interior Minister Suleyman Soylu, who visited Golyaka, said one person was seriously hurt after jumping from a balcony out of panic.
Initial images showed people covered in blankets outside their homes during the early morning. Some were seen placing blankets on the floor outside and lighting fires for warmth.
Authorities said schools would be closed on Wednesday in Duzce and Sakarya provinces.
Soylu said that, apart from a few ruined barns, there were no reports of heavy damage or building collapses, but inspections were continuing.
He said authorities would check 8,000 buildings for any damage.
National disaster agency AFAD said there were controlled blackouts in the Duzce region, urging residents not to panic.
It also reported that 101 aftershocks had been recorded.
Turkey is in one of the world's most active earthquake zones.
