The American intelligence agency, CIA, has said the United States did not inform Pakistan about the operation to capture Osama Bin Laden because it feared that Pakistani authorities would alert him. Pakistan has described the US raid on Sunday in Abbotabad as an 'unauthorised unilateral action' and said it should not be taken as a rule. The head of the CIA has told TIME magazine that it was decided that any effort to work with the Pakistanis would jeopardize the mission. He also revealed that the final decision to operate through a commando raid rather firing cruise missiles on the compound from the air was only taken at the last on Thursday. Earlier, the United States made it clear it cannot believe that slain terrorist Osama Bin Laden had no support system in Pakistan. Deputy National Security Advisor for Counter-terrorism and Homeland Security John Brennan told reporters in Washington that it is inconceivable that Bin Laden did not have a support system in the country that allowed him to remain there for an extended period of time. He also, hinted at probing any official links, while several top lawmakers accused Islamabad of playing a double-game. Meanwhile, The White House still appears to be in two minds as to whether it should publish a photograph of Bin Laden in an attempt to prove he has been killed. CIA Director Leon Panetta says in an interview with US broadcaster NBC that, gruesome or not, a photo of the dead al-Qaeda leader will ultimately be released. The US is hesitating over releasing a picture of Bin Laden's body which Mr Carney described as “gruesome”. White House counter-terrorism adviser John Brennan said earlier that material seized during the raid in Abbotabad could provide leads to the whereabouts of Ayman al-Zawihiri, thought to be Al-Qaeda's deputy leader and Bin Laden's likely successor. The White House has said that Osama Bin Laden was not armed when he was killed by US forces, but he resisted the attempt to capture him alive. A White House spokesman Carney refused to elaborate on how the Al Qaida leader resisted without a weapon.