The Slovak government will launch an investigation into a coal mine explosion which probably killed 20 workers, Prime Minister Robert Fico said ..."We can confirm the seventh body of a mine worker... has been found."...Privately-held Hornonitrianske Bane Prievidza, the country's biggest mining firm which owns the Handlova pit, said the explosion tore through an unused section of the mine...Fico's government...said there would be financial compensation for the victims' families...