NEW YORK (AP) – A terrorist plot to inflict death and destruction in lower Manhattan by using suicide bombers to attack train tunnels used by tens of thousands of commuters each day was thwarted before the scheme could get off the ground, authorities said Friday.

Eight suspects – including an al-Qaida loyalist arrested in Lebanon and two others in custody elsewhere – had hoped to pull off the attack in October or November. But federal investigators working with their counterparts in six other countries intervened before the men could travel to the United States and become a more serious threat, federal officials said.

“It was never a concern that this would actually be executed,” said Homeland Security Secretary Michael Chertoff. “We were, as I say, all over this.”

Initial reports said that the terrorists wanted to attack the Holland Tunnel, a major thoroughfare for cars entering Manhattan. But officials said the group had specifically mentioned only the PATH train tunnels that commuters travel through on their way to New York and New Jersey.

“This is a plot that involved martyrdom and explosives” and focused on the “tubes that connect Jersey and lower Manhattan,” said FBI Assistant Director Mark J. Mershon.

The men believed that by bombing the train tunnels that run under the Hudson River they could unleash massive flooding in lower Manhattan, where Wall Street and the World Trade Center site are located, New York Police Department Commissioner Ray Kelly said.

A federal law enforcement official, who spoke on condition of anonymity because the investigation is ongoing, said investigators believe that an attack on a PATH tunnel, unlike the Holland Tunnel, could have achieved that goal. The official said the suspects, five of whom remained at large, hoped to inflict damage on the U.S. economy.

Another law enforcement official said the plotters were in discussions about what explosive devices they should use, how many they needed to pull off an effective attack and points of vulnerability in the tunnel system.

“Their discussions focused on the PATH trains when they were underwater. Among the discussions but not the only one was should they use multiple devices,” the official said, speaking on condition of anonymity. “They were trying to do a combination event to resemble the London bombings.”

Investigators decided in recent weeks that the “plotting for this attack had matured to a point where it appeared that the individuals were about to move forward,” Mershon said. “They were about to go to a phase where they would attempt to surveil targets, establish a regimen of attack and acquire the resources necessary to effectuate the attacks.”

“At that point it’s entirely appropriate to take it down.”

Details of the plot – first reported by the Daily News – emerged on the one-year anniversary of the attacks on the London transportation system that killed 52 people. Officials said the timing of Friday’s report in relation to the anniversary was coincidental.

New York’s transportation system has emerged as a potential terrorist threat several times over the years. A June book by journalist Ron Suskind highlighted a reported plot by al-Qaida terrorists to kill thousands of New Yorkers by spreading cyanide gas in the subway. In May, a man was convicted of plotting to blow up a bustling subway station.

In 1993, the FBI rounded up more than a dozen men who allegedly conspired to blow up five New York City landmarks including the Lincoln and Holland Tunnels. The prosecution resulted in more than a dozen convictions.

In the latest case, a federal official said FBI agents monitoring Internet chat rooms used by extremists learned of the plot in recent months and determined that tunnels were possibly being targeted after investigators pieced together code words from their conversations.

Another U.S. official also speaking on condition of anonymity because the investigation is ongoing called the plot “largely aspirational” and described the Internet conversations as mostly extremists discussing and conceptualizing the plot. The official said no money had been transferred, nor had other similar operational steps been taken.

Officials cited the arrest of the Lebanese suspect – described as the scheme’s mastermind – as a significant break in the investigation. A Lebanese official said the man confessed to plotting to attack New York City tunnels later this year, and that he was acting on Osama bin Laden’s orders.

The operative is a Lebanese man from Beirut whom police arrested on April 27, acting on information from the FBI, a senior security official said, speaking on condition of anonymity because the investigation is ongoing. The suspect uses the alias Amir Andalousli, but his real name is Assem Hammoud.

The 31-year-old suspect told investigators he was acting “on a religious order from bin Laden and said ‘I am proud to carry out his orders’,” the official said.

The Port Authority Trans-Hudson Corporation, or PATH, serves as the primary transit link between Manhattan and neighboring New Jersey urban communities and suburban railroads. PATH presently carries 215,115 passengers each weekday.

PATH train riders took the news of the plot in stride.

“It bothers us, it scares us, but you gotta keep living, you know?” said Dudley Nosy, 21, a security guard from Brooklyn who regularly takes the train to Jersey City to see his girlfriend. “You can’t stay in the house all day long, you gotta do what you gotta do.”

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