They cite security concerns, but their concern for security appears inconsistent. Islamic Tolerance Alert from the Islamic Republic of Pakistan: "Pakistan prohibits visiting Sikh pilgrims' nagar kirtan," by Amir Mir for DNAIndia, November 23 (thanks to S.K.S.):
Pakistani authorities have stopped hundreds of visiting Sikh pilgrims from organising nagar kirtan, a religious procession, to mark the birth anniversary of Guru Nanak Dev at Gurdwara Janam Asthan in Punjab's Nankana Sahib district.
The pilgrims have also been prohibited, citing security concerns, from performing parkash (prayer) at Nankana Sahib's seven adjacent gurdwaras affiliated to Guru Nanak.
Nagar kirtan carries Sikhs' sacred book Guru Granth Sahib in a palki (palanquin) through the streets of Nankana Sahib touching seven gurdwaras affiliated to Baba Guru Nanak....
There used to be an air conditioned bus to carry Guru Granth Sahib, but the practice was suspended after law and order situation in Pakistan started deteriorating.
The Sikh visitors have criticised the restrictions imposed by the Pakistani authorities, saying if Muslims are allowed to take out processions, they too should be given permission....