Suspected militiamen have kidnapped five workers , including one French national, a Tanzanian and three Congolese, at Banro Corp's Namoya gold mine in eastern Democratic Republic of Congo , the company said on Thursday.

The attack took place during the night of Tuesday into Wednesday and an investigation is underway, Crispin Mutwedu, a senior Banro official, told Reuters, adding that a local militia has been threatening the mine recently.