The FBI has warned New York officials it's received uncorroborated information that terrorists have made threats against the city.
Landmarks such as the Statue of Liberty are said to be potential targets.
The information is based on interviews with detainees and has not been independently confirmed.
New York Police Commissioner Raymond Kelly says the FBI warned about "general threats to New York City".
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Security has been increased around monuments and landmarks, including City Hall and the Brooklyn Bridge.
PA