The Czech Republic's richest man, billionaire Petr Kellner, was killed in a helicopter crash in Alaska, his financial group PPF said on Monday. He was 56.
PPF said five people died in the crash, whose circumstances were being investigated.
"We announce with the deepest grief that, in a helicopter accident in Alaska mountains on Saturday, March 27, the founder and majority owner of the PPF group, Mr Petr Kellner, died tragically," PPF said in a statement.