At least 18 people died and 25 were injured after a passenger bus plunged into the Trishuli River in Dhading, Nepal early Monday.The bus, travelling from Pokhara to Kathmandu, was carrying more than 35 passengers when it fell into the river at Chinadhara near Charaundi in ward 3 of Benighat Rorang Rural Municipality at around 1:15am.Chief of the District Traffic Police Office, Dhading, Shishir Thapa said the death toll has reached 18, reported the Kathmandu Post.Rajkumar Thakuri, chair of the Highway Rescue Management Committee, said the 25 injured passengers have been sent to the hospital for treatment.Personnel from the Nepali Army, Armed Police Force, Nepal Police and local residents are involved in the rescue operation. Authorities said the nighttime incident has made rescue efforts difficult. Further details are awaited.