WASHINGTON/UNITED NATIONS-Pakistani envoys in Washington and New York moved quickly, making contacts with senior US and UN officials to seek their help in asertaining the whereabouts of Pakistani citizens, who were aboard a Gaza-bound humanitarian mission, which came under deadly Israeli attack in international waters. Pakistan's Ambassador to US Husain Haqqani is in touch with senior White House and State Department officials over the welfare of Pakistanis, an Embassy spokesman said. The three Pakistanis -- prominent TV personality Syed Talat Hussain, his producer Raza Mahmood and an NGO, Nadeem Ahmad Khan -- were travelling with the international aid flotilla, carrying aid supplies for Israeli-blockaded Gaza Strip. In New York, Pakistan's acting Ambassador to the UN Amjad Hussain Sial spoke to Secretary-General's Chef de Cabinet Vijay Nambiar and requested the UN chief's assistance in 'ascertaining the whereabouts, safety, security and safe return' of three Pakistani citizens. Secretary General Ban Ki-Moon, who condemned the Israeli attack, is attending a conference in Kampala, Uganda. The Chef de Cabinet assured the Ambassador of UN's full cooperation and assistance in this regard, Pakistani mission spokesman Mian Jehangir Iqbal said. The acting Ambassador termed the 'unwarranted and unprovoked' action by the Israeli forces a gross violation of international law and all norms of humanity. In Washington, the Pakistani Embassy in Washington Monday established an operation room to coordinate efforts for rescue of the Pakistani citizens. Meanwhile, the UN Security Council met in emergency session Monday afternoon less than 24 hours after Israel's lethal military operation. According to diplomatic sources, the Council sought consensus on a statement to condemn the attack. It was not seeking a resolution, which would be binding on all parties involved. At least nine civilians died and 30 more were seriously injured when the Israeli military boarded the boats which were seeking to run the Israeli blockade on Gaza. Behind closed doors, all 15 Security Council members were expected to express their views on the bloody Mediterranean incident. Israeli and Palestinian representatives would also be heard, officials said. Before the session, Riyad Mansour, the permanent observer of Palestine to the United Nations, said the attack was a 'massacre' and a crime 'against international law and international humanitarian law'. He asked the Security Council to order an independent international investigation on the incident. The investigation, he noted, should bring those responsible for the attack before the courts. The UN in Uganda, also called for a 'full investigation to determine exactly how this bloodshed took place'. Lebanon's Nawaf Salam, the Security Council President for May, called the meeting at Turkey's request. The United Nations headquarters in New York were officially closed Monday, for the US Memorial Day public holiday. According to the UN Charter, the Security Council is responsible for peace and security around the world.