CHENNAI (Agencies) - Indian Prime Minister Manmohan Singh on Saturday ruled out resuming talks with Pakistan until Islamabad took steps against those India says were responsible for an assault in Mumbai last November. Our minimum demand is that Pakistan must take effective steps to bring the culprits of Mumbai massacre to book before we resume our dialogue, he told a news conference in the southern city of Chennai, where he was campaigning for general elections. India had engaged with Pakistan for the last five years until the Mumbai attack, he said. Pakistan and India began a slow-moving peace process in February 2004 but it came to a halt after New Delhi blamed the November attacks, in which 166 people were killed, on the Pakistan-based organisation Lashkar-e-Taiba (LT). The Indian Premier also said the threat of extremism in Pakistan, whose military has launched a full-scale offensive against Taliban in the northwest of the country, was of concern to the entire region. We wish Pakistan well in its fight against the Taliban, not only in the interest of Pakistan, but also in the interest of South Asia, he said, adding that the growing influence of Taliban was not in the interest of Pakistan and the South Asia region.