<span style="color: #222222;">Sri Lankan defence secretary resigned on Thursday taking responsibility for the suicide bomb attacks on Sunday as the country remains tense in the aftermath. </span><br />'' <br />'' <span style="color: #222222;">Hemasiri Fernando said that while there had been no failure on his own part, he was taking responsibility for failures of some institutions he headed as the secretary of defence. </span><br />'' <br />'' <span style="color: #222222;">He was asked to resign yesterday following reports that security agencies failed to act on intelligence inputs about the attacks. </span><br />'' <br />'' <span style="color: #222222;">In a related development, Australian Prime Minister Scott Morrison has confirmed one of the suicide bombers involved spent time in Australia on a student and a graduate skilled visa. </span><br />''