Shimla, Jul 29 (PTI) Flash flood triggered by cloud burst wreaked havoc in Himachal Pradesh's Mandi town on Monday night, killing three people, burying more than 20 vehicles and inundating several houses, officials said on Tuesday. The fury of rain was so intense that gushing waters in Sukati nallahs (drains) flowing through the city swept huge mounds of debris which entered several locations in about five-kilometer area and the worst affected was Jail Road, Saini Mohalla and Zonal hospital area. Also Read | Deoghar Road Accident: 18 Kanwariyas Killed in Bus-Truck Collision in Jharkhand, Nishikant Dubey Offers Condolences to Victims' Families (See Pics and Video). "Three people died, one sustained injuries while one woman is missing, Deputy Commissioner, Mandi, Apoorva Devgan told PTI on Tuesday, adding that rescue operations are in full swing and about 15-20 people have been rescued. The Chandigarh-Manali National Highway has been closed at 4 Mile, 9 Mile and Dwada as the road stretches have been washed away. Also Read | Deoghar Road Accident: 5 Killed, Several Injured After Bus Carrying Kanwariyas Collides With Vehicle Transporting Gas Cylinders in Jharkhand (Watch Video). The fresh disaster adding to the woes of the people and the administration came after a month of monsoon mayhem in the Mandi district in which 15 people died in Seraj, Nachan, Dharampur and Karsog Assembly constituencies on the night of June 30-July 1. Leader of the Opposition and former chief minister Jai Ram Thakur and DC Mandi were on the spot. Meanwhile, landslides triggered by incessant rains also blocked the Shimla-Mataur National Highway at Old Kangra Ghat, and reports of uprooting of trees and electricity have also poured from several parts of the state. The Local Met office had issued an orange alert of heavy to very heavy rainfall at isolated areas of Kangra, Mandi and Kullu districts on Tuesday. It also issued yellow warning of heavy rains at isolated places in Chamba, Shimla and Sirmaur districts on Tuesday, and Una, Kangra, Mandi and Kullu districts on Wednesday. Since the onset of monsoon in the state on June 20 till the evening of July 28, Himachal Pradesh has suffered losses to the tune of Rs 1523 crore. So far 90 people have died and 35 have gone missing in rain-related incidents and 1320 houses have been fully or partially damaged in the state. A total of 200 roads, including 121 in the disaster-hit Mandi district, were closed for vehicular traffic on Monday night and 62 power distribution transformers and 110 water supply schemes have also been affected across the state, according to the State Emergency Operation Centre (SEOC). However, the number is likely to go up after the latest update. (This is an unedited and auto-generated story from Syndicated News feed, LatestLY Staff may not have modified or edited the content body)