QUETTA Pakistani security forces arrested 12 personnel of Iranian Revolutionary Guards from Washuk district near Mashkel, a town bordering Iran, as they entered into Pakistani territory illegally, said sources on Monday. According to sources, the Iranian Revolutionary Guards were travelling in two vehicles and had entered into Jowdar area of Pakistan. The security forces arrested them and took them away for necessary investigations. When the spokesman of Frontier Corps (FC) Balochistan was contacted, he told TheNation the arrested men were Iranian civilians and not the Revolutionary Guards, adding that they were being interrogated. However, he did not disclose their number. Sources said the Foreign Ministry and other concerned authorities had been informed regarding the arrest. Some sources say that the Iranian border security officials have confirmed arrest of Revolutionary Guards who were carrying out an operation against the banned organisation, Jundallah, in their own area when they mistakenly entered into Pakistani territory. Agencies add: Talking about the arrest, Balochistan Home Secretary Mohammad Akbar Durrani told AFP, There are 12 Iranians who have been arrested along with two vehicles. They are being interrogated, he added but declined to give any details on the possible identities of the men. We informed the Foreign Office about the arrests, he said. A paramilitary spokesman said only that 'some Iranians who intruded four kilometres into Pakistani territory were arrested at Mashkel, some 400 kilometres west of Quetta. Its a serious matter. We are investigating why they crossed into our territory, said a border security official while declining to be identified, as he is not authorised to speak to the media. The Iranians were in detention and it was not clear when they would be released, the Pakistani officials said. Iran says those behind October 18 attack that killed 42 people, including 15 of its elite Revolutionary Guards, sneaked across the Pakistan border. On Monday, Guards chief Mohammad Ali Jafari once again ramped up pressure on Islamabad to hand over Abdolmalek Rigi, the leader of the Sunni rebel group Jundallah (Soldiers of God) who Tehran says is based in Pakistan. We are expecting this (Pakistani) government to cooperate with Iran in apprehending this guy (Rigi), he said, adding that Islamabad was under the influence and pressure of America. Islamabad has strongly denied that the Jundallah attack was launched from its soil. Meanwhile, the Islamic Revolution Guards Corps (IRGC) has rejected the claim that the arrested persons are its members. Reacting to the report, head of the IRGCs public relations office Brig Gen Sharif told Press TV that the detainees were not members of the IRGC. That part of the report related to Sepah [IRGC] lacks credibility and is not true, Sharif said. Another informed source told a Press TV correspondent that those arrested were Iranian border police who were hunting down fuel smugglers and entered onto Pakistan by mistake.