Prosecutors argued that the men, all born outside the United States, pose a flight risk. They are being held at a federal detention center in Philadelphia.

The men were arrested Monday night during what the FBI said was an attempt to buy AK-47 machine guns, M-16s and other weapons. They targeted Fort Dix, a post 25 miles east of Philadelphia that is used primarily to train reservists, partly because one of them had delivered pizzas there and was familiar with the base, according to court filings. Their objective was to kill "as many American soldiers as possible," the documents said.

The men have lived in and around Philadelphia for years, worshipped at moderate mosques and worked blue-collar jobs installing roofs, driving a cab, delivering pizzas and baking bread. Four are ethnic Albanians from the former Yugoslavia, one is from Jordan and one is from Turkey.

Defense lawyers for some of the men said they are considering attacking the prosecution's reliance on two paid informants who infiltrated the group more than a year ago and recorded conversations with the defendants.

Authorities said they first learned about the men in January 2006 after a tip from a clerk at a Mount Laurel electronics store. The clerk called police because a home video the men wanted transferred to a DVD looked like it might have terrorist links, U.S. Attorney Christopher J. Christie said.

Earlier this year, authorities said, the men took a training trip to the Pocono Mountains in Pennsylvania, where they fired weapons and played paintball to prepare for an attack.

Five of the men — Mohamad Ibrahim Shnewer, 22; Serdar Tatar, 23; Dritan "Anthony" or "Tony" Duka, 28; Shain Duka, 26; and Eljvir "Elvis" Duka, 23 — are charged with conspiring to kill uniformed military personnel, an offense punishable by life in prison.

Agron Abdullahu, 24, is charged with helping illegal immigrants obtain weapons. He could face 10 years in prison if convicted.