There was no reaction from Yousef or Ismoil upon hearing the verdict. Ismoils mother, in the courtroom, began weeping.
Four other men had already been convicted in the case, each receiving a sentence of 240 years in prison.
Officials say at least one other suspect indicted in the case remains at large, believed to be hiding in Iraq. U.S. Attorney Mary Jo White said Wednesday that the investigation into the bombing would continue.
The case investigation will never be over, in a sense, until we track down every single person who had any conceivable role, she said. Weve obviously done the vast bulk of the work here, but the investigation is not over.
The attack on the trade center was, at that time, the worst terrorist attack ever on U.S. soil and brought home to the American public their possible vulnerability to Middle Eastern terrorism.
After the attack, both Yousef and Ismoil fled the United States on commercial airline flights. A 2 million reward helped lead to the capture of Yousef in Pakistan in 1995. Ismoil was captured that same year in Jordan.
Last year, Yousef was also convicted of conspiring to kill Americans by placing bombs on more than a dozen airliners in the Far East.
During their trial, prosecutors presented evidence linking Yousef to a storage shed and apartment in Jersey City, New Jersey, where they said the bomb was made. Yousefs fingerprints were also found on bombmaking manuals.
A federal agent accompanying Yousef on his flight back from Pakistan testified during the trial that Yousef bragged about his role in the attack. Yousefs lawyer attacked that testimony, accusing the agent, Brian Parr, of lying.
When he was captured in Jordan, Ismoil claimed he did not know there was a bomb in the truck an explanation one of the prosecutors in the case dismissed as a pathetic lie.
Ismoils defense attorney, Louis Aidala, said he planned to appeal the verdict and that part of his argument for overturning the verdict will be that he wasnt allowed to present information showing Ismoil had been duped by Yousef.
Correspondent Mary Ann McGann contributed to this report.
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Message Board World Trade Center bombing trial Video Almanac 1993 Bomb blasts World Trade Center
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