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An anonymous reader writes
"A planned terrorist attack on New York City was reportedly foiled by FBI agents who monitored chat rooms frequented by extremists. Lebanese authorities captured an Al Qaeda member who confessed to the plot, and stated that Abu Musab al-Zarqawi had pledged financial and other support for the operation. Although the planning for the operation was not far along, according to U.S. officials, they had already been monitoring the plot for a year."
From the article:
"A government official with knowledge of the investigation said the alleged plot did focus on New York's transport system, but did not target the Holland Tunnel. New York senator Charles Schumer said: 'This is one instance where intelligence was on top of its game and discovered the plot when it was just in the talking phase.' The Holland Tunnel is protected not just by bedrock, but also by concrete and cast-iron steel. One counter-terrorism source told the Daily News it was doubtful a plot to blow it up would be feasible, saying huge amounts of explosives and a detailed knowledge of blast effect would be necessary."