Slain terror mastermind Osama Bin Laden was plotting massive attacks on America when he was killed in his hideout in Pakistan, it has emerged.
Sensitive information seized from Laden's residence by the US. Nay SEALs show that he had made elaborate plans for attacking U.S. cities like New York, Washington, Chicago and Los Angeles on important days like July 4 and Christmas.

Bin Laden's followers were also planning to strike the U.S. on the tenth anniversary of the 9/11 attacks on the World Trade Centre that killed nearly 3,000 people. U.S. officials have revealed that like on 9/11 Al-Qaeda planned to attack mass transit systems on the anniversary of the biggest attacks on the U.S. soil in history.

As of February 2010, al Qa'ida was allegedly contemplating conducting an operation against trains at an unspecified location in the United States on the 10th anniversary of September 11, 2001, according to a bulletin.

The bulletin says Al Qaeda was planning to derail train while they were passing a valley or a bridge. However, the U.S. government has said there is no evidence these pre-planned attacks would ever take place. The Department of Homeland Security (DHS) has said there would be no National Terrorism Advisory System alert after the new findings.

We have no information of any imminent terrorist threat to the U.S. rail sector, but wanted to make our partners aware of the alleged plotting,' DHS press secretary Matt Chandler told ABC News.