As a result of this activity, this person was tried and convicted.
"Faris admitted that upon returning to the United States from Pakistan in April 2002, he researched "gas cutters" - the equipment for severing bridge suspension cables - and the New York City bridge on the Internet.
Between April 2002 and March 2003, he sent several coded messages through another individual to his longtime friend in Pakistan, indicating he had been unsuccessful in his attempts to obtain the necessary equipment. Faris admitted to traveling to New York City in late 2002 to examine the bridge, and said he concluded that the plot to destroy the bridge by severing cables was unlikely to succeed because of the bridge's security and structure. In early 2003, he sent a message that "the weather is too hot" - a coded message indicating that the bridge plot was unlikely to succeed.
Federal law prohibits the providing of material support and resources to designated foreign terrorist organizations. Al Qaeda was designated by the Secretary of State in 1999 to be a foreign terrorist organization, and redesignated as such in October 2001.
The Faris case was prosecuted by attorneys from the U.S. Attorney's Office for the Eastern District of Virginia and the Counterterrorism Section of the Criminal Division, U.S. Department of Justice, along with assistance from the U.S. Attorney's Office for the Southern District of Ohio. The investigation was led by the Federal Bureau of Investigation."
http://www.usdoj.gov/opa/pr/2003/October/03_crm_589.htm