Islamabad - Pakistan Tuesday rejected some foreign media reports claiming that extremists and terrorists had attacked its nuclear facilities at least thrice over the last two years. It is rubbish. These aspersions are factually incorrect and are part of typical propaganda campaign to malign Pakistan, Pakistan Armys chief spokesman Major General Athar Abbas told TheNation. The spokesman said that important foreign powers have time and again acknowledged that security and safety of Pakistans nuclear assets was of world standard. He asserted that Pakistans nuclear assets had been secured through multi-layered security mechanism and there was no chance of them falling into the hands of the extremists or terrorists. A report published in the Indian daily 'Times of India on Tuesday, was lifted and telecast by a number of American TV channels including Fox News. Special Correspondent from Washington adds: The US military on Tuesday brushed aside an Indian Press report that 'home-grown extremists and terrorists attacked Pakistans nuclear installations three times over the past two years, saying it was unaware of such incidents. 'I can just repeat what you have heard time and time again from Chairman Joint Chiefs of Staff, Michael Mullen and Secretary of Defence Robert Gates that they are comfortable with the security steps that the Pakistani govt, the Pakistani military have in place to ensure that their nuclear arsenal is safeguarded, Pentagon Press Secretary Geoff Morrell told a news briefing. Responding to a question about the claim made in 'The Times of India report, Morrell said it was for the first time that he had heard about the reported incident, adding 'I am not in a position to talk about it in particular. When pressed further on the issue, Morrell responded: 'I dont know them to be actual attacks. It is the first (time) I have heard (of this) - so I am clearly not in a position to tell you whether we were aware or were not aware - I dont know anything what you are asking about. 'What I can tell you generically how we feel about the safeguards the Pakistani military has put in place to make sure that their arsenal is protected, he said. The incidents, according to The Times of India report, were tracked by Shaun Gregory, a professor at Bradford University in UK. They include an attack on the nuclear missile storage facility at Sargodha on November 1, 2007, and an attack on Pakistans nuclear airbase at Kamra by a suicide bomber on December 10, 2007 and perhaps most significantly the August 20, 2008 attack when Pakistani Taliban suicide bombers blew up several entry points to one of the armament complexes at the Wah Cantonment, considered one of Pakistans main nuclear weapons assembly complex. These attacks have occurred even as Pakistan had taken several steps to secure and fortify its nuclear weapons against potential attacks, particularly by US and India, Gregory was quoted as saying in the report. 'In fact the attacks have received so little attention that Peter Bergen, the eminent terrorism expert who reviewed Gregorys paper first published in West Points Counter Terrorism Centre Sentinel, said 'he (Gregory) points out something that was news to me (and shouldnt have been) which is that a series of attacks on Pakistans nuclear weapons facilities have already happened, according to The Times of India. Pakistan has all along maintained that its nuclear weapons are fully secured and there is no chance of them falling into the hands of the extremists or terrorists.