Sofia - Officials in Sofia ordered checks on buildings Sunday after two small earthquakes jolted the Bulgarian capital overnight, causing minor damage but no casualties. 

Some 2,000 worried residents called an emergency number for advice after the quakes measuring 4 and 3.5 on the Richter scale struck on Saturday evening and Sunday morning. 

The capital lies in an area at risk from earth tremors. Many buildings in the city have been converted to restaurants and business premises in recent years, raising fears about their safety. 

A devastating earthquake in southern Bulgaria killed more than 100 people in 1928. (dpa)