The US did not inform Pakistan about the closely guarded operation on the outskirts of Islamabad today that resulted in the death of al Qaeda mastermind Osama bin Laden. A senior US administration official said the information was not shared with any other country including Pakistan, adding that in such a kind of operation, the information is kept only to a few people and this was done in this case too. The official told White House correspondents that the successful 40-minute operation was carried out by two US helicopters. Besides, Osama bin Laden, three men and one woman was killed in this operation. One helicopter was damaged due to mechanical failure, but no US special forces were injured or hurt in this operation. Announcing the death of bin Laden, President Barack Obama asked Pakistan to co-operate with the US in the war against terror. In his live televised speech, Obama spoke, Going forward, it is essential that Pakistan continue to join the US in the fight against al Qaeda and its affiliates. Obama said over the years, he had repeatedly made clear that the US would take action within Pakistan if they knew where bin Laden was. Obama said that it is what they have done. But it’s important to note that their counter-terrorism cooperation with Pakistan helped lead them to bin Laden and the compound where he was hiding. Obama said, bin Laden had declared war against Pakistan as well, and ordered attacks against the Pakistani people. He said, he called Pakistan President Zardari, and his team has also spoken with their Pakistani counterpart. Obama said, they agree that this is a good and historic day for both of their nations. A senior US administration official said they would investigate as to how Osama bin Laden was living so close to Pakistan’s capital that too in a neighbourhood which was normally a residence of top retired military officials.