UNITED NATIONS - UN Secretary-General Ban Ki-moon spoke by telephone on Wednesday with President Asif Ali Zardari on the situation arising from last week's terrorist attacks in Mumbai, his spokesperson said. The UN chief also discussed the progress on Pakistan's request for a UN probe into the assassination of former Prime Minister Benazir Bhutto, spokesperson Michele Montas told the regular noon briefing while responding to questions. The Secretary-General's conversation with Zardari on the Mumbai attacks was a follow-up of his phone call to Indian Prime Minister Manmohan Singh on Tuesday. After his call, Ban Ki-moon said that he and Singh agreed it was critical to bring the perpetrators of the attacks to justice and 'that all should fully cooperate in this effort'. Details of the conversation were not immediately available. As regards the fact-finding commission on BB's killing, Monstas said the UN was not dragging its feet in setting up the body. The process has been going on since then to come to an agreement about its format, the commission's members and the funding arrangement, she said, adding, that discussions between the two sides were still going on. Benazir was killed in a gun and suicide bomb attack on Dec 27 as she left an election rally in the City of Rawalpindi.