At least six gunmen are killed in Congo, on Sunday. The attack took place in Virunga National Park in the Eastern Congo. 

There hasn't been any claim of responsibility for the incident but police suspect, rebel groups might be behind the attack.

Virunga National Park is famous as a home to some of the world’s last mountain gorillas.

The World Heritage Site is frequently attacked by the rebel groups. 12 rangers and 5 civilians were killed in an ambush in April last year.

Officials say more than 200 people have been killed since Viruga became National Park in 1925.