LOS ANGELES (CBS) — The FBI and Homeland Security say al-Qaeda had planned to target trains in the United States on the 10th anniversary of the 9/11 terrorist attacks.

New intelligence from the May 1 raid on Osama bin Laden’s compound in Pakistan is being now being disclosed to local law enforcement agencies.

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After killing bin Laden, Navy SEALs took computers, DVDs and other documents.

CBS News sources confirm al-Qaeda memos referenced attacks against Los Angeles, Chicago, New York and Washington, D.C.

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The terrorist organization was considering tampering with unspecified rail tracks, so trains would derail over valleys or bridges.

LAPD Deputy Chief Michael Downing, who heads the department’s counter-terrorism bureau told KNX 1070 the information is alarming but not at all surprising.

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Los Angeles has been a terrorist target since the so-called “Millennium Bomber” failed to hit Los Angeles International Airport in 1999.