Four miners were killed and two were injured in a coal mine accident overnight in central Bosnia, an official said Tuesday.

"An accident occurred in the night in a mine gallery. Four miners were killed and two were injured, including one seriously," Adib Zekic, a spokesman for the mine in the town of Kakanj, told AFP.

"There were a total of 28 miners in the mine at the time of the accident and all of the survivors were brought to the surface," he said, declining to comment on the cause of the accident.

An investigation was under way at the site, about 50 kilometres (31 miles) north of Sarajevo, he added.

In September last year, five miners were killed when an earthquake triggered a gas explosion at the Raspotocje mine in Zenica in central Bosnia.