HANOI: At least four people were killed and four others were missing after a flash flood swept through a mountainous village in Vietnam’s northern province of Lai Chau, state media reported on Saturday (Jul 18).The flood in Muong Than village early on Friday after days of heavy rains in several parts of northern Vietnam also injured seven people, reported the Vietnam News Agency.Vietnam is prone to deadly storms and floods during the rainy season that peaks from July through September. Natural disasters, mostly floods, killed 489 people in the country last year, according to government data.The Vietnam News Agency report…