Nagrasu Gurdwara dispute: What is the case of the alleged occupation of the gurdwara by Nihang Sikhs, what is the situation after 24 hours

According to the police, there was a dispute between the servitors of the gurdwara and some Nihang Sikh pilgrims who had arrived there over some issue. Some Nihang Sikhs then went to the roof of the gurdwara and blocked the way to the roof.