Congress President Sonia Gandhi has condemned the attack on Gurudwara Nankana Sahib in Pakistan by an unruly mob of miscreants.<br />'' <br />'' Expressing concern for the safety of Sikh pilgrims and the employees, Ms Gandhi called upon the government to immediately take up the issue with Pakistan authorities. <br />'' <br />'' She said the government should press for immediate registration of the case, arrest and action against culprits.<br />''