Why Nihang Sikhs marched to Himachal-Uttarakhand border and what caused the tensions?

Security has been tightened along the Himachal Pradesh-Uttarakhand border after a large number of Nihang Sikhs gathered at the Kulhal border in Dehradun district, protesting restrictions imposed on their entry into Uttarakhand following the recent Karnaprayag dispute. https://ift.tt/w0oxCS8