Home minister P Chidambaram today said that his Ministry has been following a particular procedure for early disposal of mercy petition cases pending before President. Replying to questions in Rajya Sabha, Mr. Chidambaram said out of 13 cases of mercy petitions since May 2009 after he took over as the Home portfolio, the decisions in respect of seven have already been taken . Replying to a specific question on the delay of the Parliament attack convict Afzal Guru for hanging to death, the Home Minister said, it is under examination in his Ministry . Mr. Chidambaram said, there is no time limit to exercise power on mercy petitions. Sharing the concern of the members over the delay, the Home Minister said, he cannot comment on the President's action in this regard. The Home Minister, however, made it clear that the government treats every case without any fear or favour or discrimination on the basis of caste, creed and religion while considering the mercy petitions. Mr. Chidambaram also denied that there is any delay in his ministry in processing the mercy petition cases.