At least 44 persons were feared dead after a private bus they were travelling in fell into the Tons river in Nerva area of Shimla district on Wednesday.
The accident took place on the border of Sirmaur district.
In all 56 passengers onboard the bus which was on its way to Tuini in Uttarakhand.
The Sirmaur police reached the site and began rescue operations. A team of doctors from Shimla and adjoining areas has also reached accident site, police sources said.