This image provided by the New York Police Department shows a graphic found on al Qaida Internet forum currently being investigated by police as a terrorist threat. Authorities are trying to identify the source. (AP Photo/NYPD)

Associated Press
This image provided by the New York Police Department shows a graphic found on al Qaida Internet forum currently being investigated by police as a terrorist threat. Authorities are trying to identify the source. (AP Photo/NYPD)
This image provided by the New York Police Department shows a graphic found on al Qaida Internet forum currently being investigated by police as a terrorist threat. Authorities are trying to identify the source. (AP Photo/NYPD)
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