A close aide of Nepal King Gyanendra, who is believed to have played a role in the royal takeover last year, was severely beaten up after a traffic row in the heart of the city.
Bharat Keshar Singh, who is also the President of the World Hindu Federation, was returning from a party on Tuesday night when his car hit a parked motorbike, near the Royal Palace, police sources said.
Heated words were soon exchanged between Singh and the motorcyle owner following which students from nearby college and other persons arrived at the scene and beat Singh and his two sons.
The students and youths turned violent after learning that a King's aide was beating up an motorcycle rider.
They also torched Singh's car following which he took shelter in a nearby hotel.
After the police came they took Singh and the two sons out of the hotel.
Singh was taken to Army Hospital for treatment while his two sons were placed in custody in Kathmandu District police office.