People from all over Pakistan come to the city of Lahore to pray at a centuries- old Islamic shrine for peace that has become the latest target of a bloody wave of militant bomb attacks. The shrine of Sufi saint Hazrat Syed Ali bin Usman Hajweri is one of Pakistan's biggest and is revered by all Islamic sects in the country and even by non- Muslim lovers of Sufism and mysticism. But it was transformed into a bloodbath on Thursday when two suicide bombers blew themselves up among huge crowds of worshippers, killing 42 people and wounding scores more. Popularly known as Data Ganj Bakhsh, the shrine was first built by emperor Sultan Ibrahim Ghazni who ruled the subcontinent India from 1059-1099, according to the provincial government, and now attracts thousands of men, women and children each day. Worshippers come to the shrine in a congested low-income neighbourhood of Lahore to pray for peace and solace and to distribute food among the poor to seek Allah's blessings. Several million Muslims in Pakistan are believed to follow Sufism, a mystical branch of the religion, although they are frowned on by some conservatives and militants have attacked Sufi shrines in the past. The huge Data Ganj complex now houses a large mausoleum and prayer hall and a range of other facilities, including a police post, exhibition hall, an industrial school for women, library, and accommodation. Data Darbar Hospital is also attached to the shrine, which is surrounded by shops and stalls selling books and merchandise such as flowers, embroidered sheets to be laid on the saint's tomb and gifts of food. Born in Ghazni, Afghanistan in 1001, Data Ganj Bakhsh is revered in the region for spreading the message of Islam to the masses of the Punjab where he migrated to in 1031. He died in 1065. Besides preaching, he also wrote books on Islam and his most famous work is entitled 'Kashf al-Mahjub' (The Unveiling of the Veiled). 