ISLAMABAD - Pakistan on Thursday acknowledged for the first time that Mumbai attacks were partially planned on its soil saying six persons have been arrested in this regard including the key leader of Lashkar-e-Taiba, Zaki-ur-Rehman Lakhvi. An FIR has also been registered against 8 persons including the arrested 6 for their alleged involvement in Mumbai attacks that killed 179 people. A copy of FIA report based on Pakistan's probe into Mumbai attacks has been handed over to Indian High Commissioner. Addressing a Press Conference here at Interior Ministry on Thursday, Advisor to Prime Minister on Interior Rehman Malik said that attacks were partly planned in Pakistan and First Information Report (FIR) had been lodged in Special Investigation Unit of Federal Investigation Agency, Islamabad. "First Information Report (FIR No. 01-2009) has been lodged under Anti Terrorism Act and Cyber Crimes and we have arrested 6 people namely Lashkar-e-Taiba leader Lakhvi, Muhammad Ishfaq, Javaid Iqbal, Zarar Shah, Abul Qaifa and Hamad Ameen Sadiq out of 8, while the remaining two are still at large", the Advisor on Interior told the media. He said that Hamad Ameen Sadiq the mastermind was the resident of southern Punjab but was living in Karachi in a rented house while an e-mail claiming responsibility for the attack with the name of Deccan Mujahideen was sent by Zarar Shah. He said during the investigation, it was revealed that the attackers used three boats namely Al Fauz, Al Hussaini and Mashallah to reach Mumbai from Karachi and Riaz, Khan and Hamad Ameen helped them in reaching Mumbai. He added that security agencies had also traced the shop and its owner from where the culprits bought the engine and the boat while a bank and a Money Exchange company were also traced which were used for the transaction of money. He informed that the Mumbai carnage also led the investigations to countries like Spain, Austria, Middle East and Italy. "The Internet domain for communication was bought from Spain and a Pakistani national living in Barcelona, Javaid Iqbal paid its money that was more than 200 dollars and some payment was also made in Italy. He added that one domain also leads to Russia. Malik told that the culprits used e-mail, VOIP and Sims of different mobile phone services were also used for communication purpose. Advisor on Interior said that investigations were not over and Pakistan needs some more information and proofs to make the prosecution strong and solid and accordingly the Government of Pakistan had completed a formal list and handed over to Indian Officials based on 30 questions. "We need the statement of Ajmal Kasab. DNA tests and the finger prints of all the attackers and we also want to know the telephone number they used while mostly Sims were bought from India and we want to know that how did they purchase these", he said. He added that 30 Sims in total were used by them for communication and Pakistan wanted to know the details of their talks while full cooperation of India was also required to recognize some of the provided pictures of the culprits as these were not much visible. He said, "Pakistan realizes the pain of Indian people and government and we are fully concerned and serious to bring the criminals to justice." The action will prove our sincerity and we are collecting such evidences that could speak for themselves while no victimization would be done. Meanwhile, Pakistan formally handed over to India its response to Indian dossier on Mumbai attacks while seeking more information to carry forward the probe into horrendous act of terror. Foreign Secretary Salman Bashir handed over Pakistan's response to the Indian dossier to Indian High Commissioner Satyabrata Pal during a meeting here at the Foreign Office. Foreign Secretary Bashir also handed over a list of 30 queries seeking further information to take forward Pakistan's probe into the Mumbai attacks. Indian High Commissioner Pal was also briefed by Advisor to Prime Minister on Interior Rehman Malik on the findings of the probe conducted by Federal Investigation Agency (FIA) and the actions taken so far by Pakistani authorities. Addressing his weekly press briefing, Foreign Office spokesman Abdul Basit said, "The handing over of response to the Indian dossier demonstrates Pakistan's sincerity and commitment to fight terrorism." "It also reflects Pakistan's sincerity to bring the perpetrators of the Mumbai attacks to justice," he said. He said Pakistan's findings clearly showed that it was serious and sincere in its investigations adding it was hoped that India would reciprocate with the same spirit of cooperation. Answering a query, he said issue of release of renowned nuclear scientist Dr. A.Q. Khan on court order was discussed in talks between Pakistani officials and US President's special envoy Richard Holbrooke. He said the United States was told that Dr. Khan issue was a closed chapter and it was now counter productive to speculate about the court's judgment given about his release. Pakistan, he said, reiterated its resolve to non-proliferation efforts and all necessary legislative and administrative measures had been taken to ensure effective export control and prevent possibility of nuclear proliferation. "The United States understands Pakistan's position on the vital issue," he said. To another query, Basit said Dr. Khan had no access to any strategic facility, enjoyed no official status and had nothing to do with country's nuclear programme any more. He said Pakistan was making hectic efforts for the release of Dr. Aafia Siddiqui, a Pakistani national currently detained in US adding, "We hope these efforts will yield positive results." He also condemned the kidnapping of a senior UN official from Quetta saying all possible steps were being taken for his early and safe recovery. To a question on killing of Polish engineer, he said the relevant Pakistani authorities had yet to confirm the killing of Polish national. Basit said the terms of reference of UN Inquiry Commission into the assassination of former Prime Minister Benazir Bhutto were finalized in consultation with Pakistan. Pakistan would pay the seed money while other members of the United Nations would make contributions to defray cost of the inquiry, he said adding that the amount of the seed money was being worked out in consultations with United Nations.