updated 6/3/2009 5:23:05 PM ET 2009-06-03T21:23:05

Four men accused of crafting a terrorist plot targeting synagogues and military planes in New York have pleaded not guilty to additional charges.

James Cromitie, Laguerre Payen, David Williams and Onta Williams continue to be held without bail. They appeared Wednesday in federal court in suburban White Plains.

They were arrested May 20 after an elaborate FBI sting and charged with conspiracy counts. The new charges include attempting to use weapons of mass destruction and conspiracy to kill U.S. officers and employees.

They could face life in prison if convicted.

The men are ex-convicts, and relatives have said they were struggling. Payen's lawyer says his client is schizophrenic and bipolar.

Copyright 2009 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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