Bulgaria's sole nuclear power plant Kozloduy continued its regular operations after a strong earthquake shook the country late on Wednesday, officials said.
Kozloduy nuclear plant is situated on the Danube river, which makes the border with Romania, 200 kilometres north of Sofia.
Last night's earthquake did not affect the technological regime of nuclear power plant Kozloduy, director Yordan Kostadinov told the national radio.
The earthquake, epicentred in the Vrancea Mountain in southern Romania, measured about 5.5 on the Richter scale and was felt across the country.
The tremour was felt strongest in Northern and Northeastern Bulgaria. In settlements along the Danube river, which makes Bulgaria's border with Romania, people rushed to the streets in panic. In the town of Silistra the tremour cracked the walls of buildings.
An earthquake hit Romania simultenously, shaking buildings in the capital Bucharest but apparently causing little damage.