Flood waters are threatening to cut off Lae City in Papua New Guinea from the Highlands, Madang and parts of Morobe.
The Post Courier newspaper reports that heavy rain on Tuesday night along the Finnistere Range flooded the Yalu River and burst its banks, prompting the disaster centre in Lae to issue flooding warnings.
The Yalu bridge along the key Okuk Highway is at risk of being destroyed by the flooding.
Located 20 kilometres outside Lae City, the bridge connects the highway to parts of Morobe, the Highlands and Madang province.
By Wednesday night, the floodwaters had covered nearly a kilometre of the road and there was still a lot of water flowing over the highway.