Prague  - Firefighters on Sunday recovered the bodies of four workers who were killed when a building collapsed in the Czech capital two days earlier, officials said.

Police had knowledge of those who worked at the site in Prague but would not release nationalities of the victims until experts identify their remains, spokeswoman Iva Knolova said.

Sources told the German Press Agency dpa that the workers were likely from other countries in Eastern European.

The workers were on the ground floor of the uninhabited building that was being renovated when four of its ceilings caved in on them on Friday.

They were buried under three metres of rubble consisting of broken concrete, bricks, timber and fine dust, firefighters said. It was not clear what caused the structure to collapse.  dpa