"This was one of the numerous places of non-Muslim worship which had been burned in Lahore. Baoli Sahib, Gurdwara Chaumala Sahib and others had been burned before. Even the famous Dehra Sahib, held in highest sanctity by the Sikhs as being the place of martydom of Sri Guru Arjan Dev, fifth Guru of the Sikhs, was attacked. The Sikh guards and priests of this Gurdwara were mostly killed."
January 1, 1970
https://en.wikiquote.org/wiki/Gurdwara_Dera_Sahib