Days after floods killed more than 100 people - possibly many more - rescuers used helicopters and climbed through mountain paths to reach nearly 4,000 people trapped by landslides in a narrow valley near a Hindu shrine in the northern Himalayas, officials said Thursday. The helicopters ferried rescue workers and doctors along with equipment, food and medicine to Kedarnath in the state of Uttrakhand, the nearest town to those trapped in the valley, said Air Commodore Rajesh Prasad, who is overseeing the operations. Amit Chandola, a state spokesman, said authorities so far have been unable to reach eight villages feared washed away by the weekend floods in the worst-hit districts of Rudraprayag and Chamoli. He said the official death in Uttrakhand is 104 but added, "We don't know yet what happened to hundreds of people living there." An additional 17 people died in collapsed homes in neighboring Uttar Pradesh state, said R.L. Vishwakarma, a state police officer. Uttrakhand's Chief Minister Vijay Bahuguna told the New Delhi Television news channel that hundreds of people have lost their lives, but that the exact number would be known only after a survey. A joint army and air force operation has so far evacuated nearly 13,000 people stranded in the area but nearly 62,000 people remained cut off, officials said. The flooding washed away roads and nearly two dozen bridges, demolished 365 houses and partially damaged 275 others in Uttrakhand, the state government said. Most of those stranded are Hindu pilgrims who were visiting four revered shrines.