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Documents found at Osama Bin Laden's Pakistan home suggest he was planning attacks on the US, including on the 10th anniversary of 9/11, reports say.
One plan was to target a US rail route, US officials revealed, although no imminent threat was detected.
Information about the apparent plans unearthed in Pakistan was contained in a joint FBI and Homeland Security bulletin, the Associated Press news agency said.
The bulletin, circulated to law enforcement officials, said the idea to tamper with an unspecified US railway track was found in handwritten notes taken from Bin Laden's compound.
According to the bulletin al-Qaeda operatives planned to derail a train so that it would plunge into a valley, or from a bridge, AP reported.