BUKAVU, DR CONGO Rangers at a UN-listed wildlife sanctuary in eastern DR Congo protested on Tuesday for the sixth day running over what they say is months of unpaid salary, witnesses said. Eco-guards at the Kahuzi-Biega National Park set up barricades at the entrance preventing employees from going in, although inhabitants of the vast park were allowed through, they told AFP. The park, inscribed on the UNESCO World Heritage list, comprises 600,000 hectares (1.5 million acres) of tropical rainforest that is notably home the world s biggest population of eastern lowland gorillas. The rangers began their protest on December 24, saying they had not been paid for 10 months. Witnesses say that over the following four days, the protestors fired warning shots at the park entrance.