People flocked to downtown areas of Hanoi, HCMC and other cities across Vietnam to join New Year's Eve firework shows and countdown events Sunday night. Bangkok, Hanoi, Jakarta (GMT+7) vnexpress 0h10 Fireworks light up HCMC skiesFireworks explode above the Saigon River tunnel in HCMC at midnight to welcome the new year. Photo by Thanh TungThousands…