India today asked Islamabad to fulfil its “obligation and commitment” to bring to justice the perpetrators of the 26/11 carnage. In a strongly-worded diplomatic note, issued on the eve of Mumbai terror attacks anniversary, New Delhi expressed “regret” for not receiving feedback on several issues raised by it. Government sources said, the issues include information on the names of seven persons involved in the attacks given by Home Minister P Chidambaram during his meeting with his Pakistani counterpart in June at Islamabad. The sources said New Delhi also reminded Islamabad that there has been no feedback from Pakistan on its request for voice samples of Pakistan-based “handlers” of the 10 terrorists who attacked Mumbai on November 26, 2008 in which 166 people were killed.