The father of New York City subway bomb plotter Najibullah Zazi pleaded guilty to visa fraud Friday in Brooklyn federal court for lying to help a nephew get into the United States five years ago.

Mohammed Wali Zazi, 56, a former city taxi driver who now lives near Denver, was convicted of obstruction of justice and conspiracy earlier this year for orchestrating the destruction of some of his son's bomb-making materials. He was never accused in the plot itself.

Zazi, an Afghani who came to the United States from Pakistan in 1990 and is a citizen, admitted in court that he lied on immigration forms to help nephew Amanullah Zazi.

"Amanullah was not my biological son and I told my attorney to mark it as my real son," he told U.S. District Judge John Gleeson.

Zazi faces a maximum of 50 years in jail on the old and new charges. He will be sentenced on Dec. 2.

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