The death toll from a fire at a mine owned by ArcelorMittal in Kazakhstan rose to 42 people on Sunday as a search for four miners continued, the Ministry for Emergency Situations said.
"The search operation is hampered by the presence of destroyed mining equipment, as well as rubble in some places", the ministry said in a statement.
Rescuers are searching for miners in two areas of the mine 4 kilometres (2.5 miles) apart, it said.