NEW DELHI (Agencies) - Sharing his views with politicians at an all-party conference, Indian Prime Minister Manmohan Singh on Sunday announced setting up of a Federal Investigating Agency besides strengthening anti-terrorist apparatus and measures to reinforce maritime and air security in the wake of the terrorist savagery in the country's financial capital Mumbai, according to the Indian media. Leader of the Opposition LK Advani, BJP President Rajnath Singh and Shiv Sena leaders did not attend the conference. Congress president Sonia Gandhi, Home Minister P Chidambaram, Defence Minister A K Antony, External Affairs Minister Pranab Mukherjee, Railway Minister Lalu Prasad and Bharatiya Janata Party (BJP) leaders V K Malhotra and Jaswant Singh were among those attending the meeting at the Prime Minister's residence. Samajwadi Party leaders Mulayam Singh Yadav and Amar Singh, Communist Party of India-Marxist General Secretary Prakash Karat, and D Raja and A B Bardhan of the Communist Party of India also attended the meeting. Manmohan convened the meeting to take stock of the security situation and ways to strengthen the intelligence machinery in the country following three days and three nights of Mumbai terror that killed 183 lives and injured over 300. In the wake of deadly terror strikes in Mumbai, Singh said the political class of the country should give a message of collective approach in dealing with the situation of a terrorist attack of this magnitude. He appealed to parties to rise above political considerations to meet the challenge unitedly. "Terrorists and enemies of our nation must know that their actions unite rather than divide us," he said in his opening remarks at the all-party meeting. "In the face of this national threat and in the aftermath of this national tragedy, all of us from different political parties must rise above narrow political considerations and stand united. We should work together in the interest of the country at this critical juncture," he said, while seeking help from the political parties. While noting that "several measures are already in place to deal with the situation", he underlined that much more needed to be done "and we are determined to take all necessary measures to overhaul the system". "We are further strengthening maritime and air security for which measures have been initiated. This will involve the navy, the Coast Guard and the coastal police, as well as the air force and the Civil Aviation Ministry. "The anti-terrorist forces of the country will be further strengthened and streamlined. The National Security Guard (NSG), the principal anti-terrorist force of the country, will be given additional facilities and the size of the force is being augmented. Steps have also been initiated to establish another four NSG hubs in different parts of the country. Additionally, the special forces at the disposal of the centre would be appropriately utilised in counter-insurgency operations." The government has also finalised a set of legal measures based on the recommendations of the Administrative Reforms Commission which includes the setting up of a Federal Investigating Agency, the Indian Prime Minister told some 20 political leaders from the Treasury and Opposition Benches. Manmohan Singh said that unlike the recent terrorist attacks across the country, the Mumbai nightmare was different in several aspects. "It was an attack by highly trained and well-armed terrorists targeting our largest city. They came with the explicit aim of killing large numbers of innocent civilians, including foreign visitors. They sought to destroy some of the best-known symbols of our commercial capital. "The ordeal at Mumbai, which occupied the attention of the entire nation, has finally come to an end. All of us share the grief of those who have lost their loved ones in this dastardly and brutal attack and also the pain and anguish of those grievously wounded. "We cannot lessen their grief. But we will do all we can to alleviate their suffering. I give you my solemn assurance that we will look after the needs of those who survive this horrible tragedy." He hoped that the discussions at the meeting would lead to a consensus on steps required to be taken, saying that the parties should build a consensus on what needs to be done to strengthen the ability of the system to meet these threats. Earlier PTI reported that the Indian government is considering suspending a peace process with Pakistan following the attacks. "There is a view in the government that India should suspend the peace process and composite dialogue to show that it is not going to take lightly the deadly carnage in Mumbai," the official news agency quoted unnamed officials as saying. It said the government, "including Prime Minister Manmohan Singh, is very upset as it feels that Pakistan has not kept its promise made at the highest level to end terrorism directed at India". Sources told PTI "a series of high-level meetings at political and official levels will be taking place in the coming few days to decide what to do". Meanwhile, political heads began to roll on Sunday in the aftermath of the carnage with Indian Home Minister Shivraj Patil finally forced out of the Cabinet and replaced by P Chidambaram who was holding Finance, a portfolio Prime Minister Manmohan Singh took over. Indian National Security Adviser MK Narayanan also submitted his resignation in the wake of the terror attacks. The moves come amid growing pressure on the Indian government to explain why it was unable to prevent the militant strike. The death toll was revised down to 172. Patil's dismal reign in the key Ministry ended Sunday morning after he resigned under the cover of owning moral responsibility for the Mumbai attacks and succumbing to growing anger over intelligence failures leading up to the incident. Shivraj Patil said he took 'moral responsibility' for the assault by heavily-armed militants and transformed parts of Mumbai into a war zone for three days. Reflecting the intense heat on the government, Chidambaram, who was grappling with the global financial meltdown, was shifted from his Finance Ministry office to the neighbouring Home Ministerial perch in North Block. The National Security Adviser also offered to resign Sunday in the wake of the devastating militant attacks in Mumbai, government officials and reports said. Confirming reports by Indian news channels, the officials said MK Narayanan told Prime Minister Manmohan Singh he was ready to step down. But there were conflicting reports over whether Singh had accepted. But later, the Indian Prime Minister's Office said Narayanan would be staying on, without confirming or denying whether he had put in his papers. "These reports about resignation are wrong. Narayanan continues to be the NSA," a PMO official said while reacting to media reports that he had quit, according to a Doordarshan report. Maharashtra Chief Minister Vilasrao Deshmukh may also become a casualty of the Mumbai terror attack. Some top officials at the Centre could also be shunted out. An aide to the prime minister also said "more senior members of the government are likely to be shown the door" in the wake of the attacks, which left close to 200 dead. The government sources said India's home secretary, domestic intelligence chief and head of the Coast Guard were likely to be asked to go.