Kathmandu, August 27 The Nepal Tourism Board (NTB) has stated that a total of 644 travellers, including 127 Nepali nationals, have been reported missing following Wednesday’s devastating flash flood in the Bhotekoshi and Trishuli rivers, affecting Rasuwa, Nuwakot, Dhading, and Gorkha. In its “Situation Update – 3” issued Thursday, the Ministry of Culture…