India today demanded credible action by Pakistan in the 26/11 terror attack case.Foreign secretary Nirupama Rao has said that core issue of addressing the country's concerns on the Mumbai carnage will be part of Foreign Secretary level talks with Pakistan. She said that New Delhi has underlined to Islamabad to take the evidence and additional evidence provided in the 16 dossiers on board seriously to bring the terror masters to justice.<br/><br/>AIR correspondent reports that foreign secretary Nirupama Rao who is leaving for Islamabad tomorrow to hold discussions with his Pakistani counterpart Salman Bashir to prepare the agenda for talks between the External affairs minister and his Pakistani counterpart on 15 of next month.