WASHINGTON Prime Minister Syed Yousuf Raza Gilani and his Indian counterpart Manmohan Singh had an informal meeting on the sideline of Nuclear Security Summit. Gilani and Manmohan Singh spoke to each other at a reception hosted by the US President Barack Obama, who convened the 57-nation summit, a Pakistan Embassy spokesman said. Both leaders were present at the same place and so they shook hands and talked, he said, adding it was not a formal meeting. The two leaders last met in Sharm El Sheikh on the sidelines of the Non-Aligned Summit in July last year. Gilani also had the opportunity to meet briefly with Japanese Prime Minister Yuko Hatoyama, King Abdullah II Ibn Al Hussein of Jordan, Argentinian President Cristina Fernandez de Kichner, Prince Muqrin Ibne Abdul Aziz Al-Saud, President of Saudi Arabian General Intelligence, and South African President Jaco Zuma. The Mondays top-level Indo-Pakistan meeting came a day after the Indian leader complained to President Obama that Pakistans Government lacked the will to punish those responsible for the Mumbai attacks. The November 2008 attacks left 174 people dead, including nine gunmen, and soured ties between India and Pakistan. Late last year, Pakistan charged seven people in connection with the attacks. India put peace talks on hold after the attacks, blaming them on Pakistan-based militants, also suggesting what it calls state elements were involved. Pakistan has firmly denied any involvement. In February, the two sides held their first formal talks since the 2008 attacks and agreed to remain in touch. Indian diplomats were quoted in media reports as saying that the two prime ministers exchanged little more than pleasantries and did not hold substantive discussions. But Pakistans Foreign Minister Shah Mehmood Qureshi voiced hope for extensive diplomacy, saying it was the only way forward between the two countries. We have to look beyond Mumbai. Mumbai was sad, Mumbai was tragic, but we are as much victims of terrorism as India is and so this terrorist threat becomes a common challenge, Qureshi told reporters. He appealed to US President Barack Obama to nudge the two nations together, voicing concern about the views of both Indias ruling Congress party and the Bharatiya Janata Party (BJP). Prime Minister Manmohan Singh means well. We have no doubt about that, Qureshi said. But the problem is that he has not been able to carry domestic politics along within the Congress party and the BJP, he said. Singh has also asked Obama to use his influence, on Sunday asking him to pressure Pakistan to rein in anti-Indian militants. Singh told Obama that unfortunately there was no will on the part of the Government of Pakistan to punish those responsible for the terrorist crimes in Mumbai, Indian Foreign Secretary Nirupama Rao said Sunday. US authorities have welcomed what they see as Pakistans growing resolve to fight against homegrown and Afghan Taliban. But the United States has also encouraged Pakistan to do more against Lashkar-i-Taiba, which some experts believe Islamabads powerful military and intelligence service find useful to pit against India. Gilani confirmed that Obama raised Singhs concerns to him and said his civilian Government had no tolerance for extremists. Gilani, speaking to a roundtable of reporters, vowed never to allow a handful of extremist bigots and terrorists to represent our peaceful way of life and inclusive culture. We dont want our soil used against any country and neither would we allow somebody elses soil to be used against Pakistan, Gilani said. Gilani said that Pakistan had already banned some extremist groups and frozen their bank accounts and was seeking more evidence from India against Lashkar-i-Taiba. If we have more effective evidence, certainly they will be brought to justice, Gilani said. But analyst Bruce Riedel, a former CIA officer who led a major strategy review for Obama, said that Lashkar-i-Taiba had continued to flourish in Pakistan. What makes it so dangerous is that, unlike the mostly Pashtun Taliban, it recruits its followers in the Punjab, the same place where the Pakistani army recruits its officer corps, he wrote in a paper of the Brookings Institution, a Washington-based think-tank.