Police say at least 20 people were killed and another 17 hurt when bus drove off a highway in Nepal and plunged into ariver.Police office said the bus rolled about 100 meters (330 feet) down the slope early on Friday and crashed into the fast-flowing Trishuli river near Chandibhanjyang, about 120 kilometers (75 miles) west of the capital, Kathmandu.Police and villagers were helping the injured and pulling the dead from wreckage, which was mostly submerged in the river.Police are investigating the cause of the pre-dawn accident.Road accidents in mountainous Nepal are generally blamed on poorly maintained vehicles and roads.Stay updated on the go with Times of India News App. Click here to download it for your device.