A fire killed four patients at a Covid-19 hospital in the Romanian capital Bucharest and 102 others were evacuated, officials said. It is the second deadly hospital fire in the European Union state in under three months, Reuters reports.

The fire, which has since been extinguished, broke out in one of the buildings of the Matei Bals hospital. Four rooms were affected and prosecutors were investigating the cause of the fire.

The evacuated patients had medium to serious Covid-19 infections and most were using oxygen, the hospital’s manager said. About 44 of them have been sent to other Covid-19 hospitals across Bucharest, and the remaining patients were re-located to other buildings at Matei Bals.