A follower of extremist Sheik Omar Abdul Rahman pleaded guilty Monday to masterminding a plot to blow up New York City landmarks to wage a war of urban terrorism against the United States.

Siddig Ibrahim Siddig Ali pleaded guilty to all the counts against him, U.S. attorney's office spokesman Marvin Smilon said. He did not say whether prosecutors had made a deal with him in exchange for the plea.John Jacobs, an attorney for another defendant, said Siddig Ali had signed a cooperation agreement and then read a statement this morning implicating the other defendants.

Siddig Ali, 34, of Jersey City, N.J., was accused of conspiracy to wage a war of urban terrorism; solicitation and conspiracy to murder Egyptian President Hosni Mubarak; the attempted bombings; and shipping a firearm, using and carrying a firearm, and carrying destructive devices for that bombing plot.

The plea comes the week after testimony began in the trial of Abdel-Rahman and 11 followers, including Siddig Ali, on charges they plotted a holy war against the United States that included a day of bombings and mayhem "the likes of which the world has never seen."

It is the largest terror trial in U.S. history.

At opening statements, prosecutor Robert Khuzami said, "This is a case about war. . . . The enemy is the United States, the battlefield the streets and tunnels of New York City."

In a single day, he said, the men wanted to blow up the United Nations, the FBI headquarters, the Lincoln and Holland tunnels and the George Washington Bridge. The tunnels and the bridge all connect New York and New Jersey.

The defendants also allegedly plotted to assassinate Mubarak and kidnap President Nixon and Henry Kissinger. They face life in prison if convicted.