KATHMANDU (AFP) - Some 50,000 people have been forced to flee after monsoon rains washed away a dam in southern Nepal and were taking refuge in makeshift shelters, schools and temples, an official said Wednesday. The dam on the Saptakoshi river burst Monday following heavy downpours, government disaster management official Suman Ghimire said, adding that rescue teams of locals and security personnel were helping victims. "Five villages have been flooded and the residents have been evacuated," said Ghimire. Nepal's new Maoist Prime Minister Prachanda was travelling to the flooded Sunsari district bordering India, 200km southeast of the capital Kathmandu to check on rescue efforts, Ghimire said. "We think people may have been killed but we have not been able to verify the number," the official said. The annual June-to-September monsoon causes scores of deaths in the mountainous country through flooding and landslides. Meanwhile, five people were killed as Typhoon Nuri slammed into the northern Philippines Wednesday, triggering heavy rain and warnings of possible storm surges, officials said. Packing maximum sustained winds of 140km an hour at the centre and gusts of up to 170km per hour, at 4:00 pm (0800 GMT) Nuri was 90km northwest of the northern province of Cagayan, moving northwest at 15km per hour. "It has made landfall. She is lashing northern Luzon," said Nathaniel Cruz, chief forecaster at the state weather bureau. "Almost all of northern Luzon is experiencing the fury of Karen," Cruz said, referring to the local name of Typhoon Nuri. Five people including a 72-year-old woman and three children were killed when landslides crushed their houses in the northern regions while a farmer was missing after being washed away by an overflowing river in Ilocos province, the civil defence office reported. Six people were killed when torrential rains caused a landslide in a region of northern Myanmar famed for its rubies, state media reported Wednesday. Five family members and their guest died when their house was buried in the landside in a village in Mogok Township, the New Light newspaper said. The region is known as the Valley of the Rubies for its plentiful supply of the highly-prized gems. Heavy rains have also flooded low-lying areas around the southern main city of Yangon since a week ago, the paper added, although no casualties have been reported there. It said authorities distributed seedlings and rice seed to affected farms.