Raja Lahrasib Khan, 56, a naturalized US citizen of Pakistani origin, was charged Saturday with attempting to provide material support to a foreign terrorist organization.

According to the criminal complaint, Khan also discussed a possible bomb attack on an unspecified US stadium this summer. Speaking with a man identified only as Individual B, Khan allegedly said bags containing remote-controlled bombs could be placed in the stadium and then, “boom, boom, boom, boom,” prosecutors said.

The balding, bearded Khan, clad in a wrinkled nylon jacket, rumpled pants and sneakers, appeared before US Magistrate Geraldine Soat Brown on Saturday. She ordered him held pending a status hearing set for Tuesday.

Prosecutors also said the investigation was unrelated to one that produced charges against an American citizen, David Coleman Headley, and a Canadian businessman living in Chicago, Tahawwur Rana, in the November 2008 terrorist attacks that left 166 people dead in the Indian city of Mumbai. Ilyas Kashmiri, a terrorist leader believed to be based in the tribal areas of western Pakistan, is charged in that indictment along with Headley and Rana in connection with a planned attack on a Danish newspaper that published cartoons depicting the Prophet Muhammad (peace be upon him) in 2005.

Headley pleaded guilty last week to the charges. Rana has pleaded not guilty to conspiring to provide material support to terrorists in Denmark and India.

The complaint against Khan said he told an undercover agent he was acquainted with Kashmiri. Authorities say Khan claimed to have known Kashmiri for 15 years and said he came to believe that Kashmiri was receiving orders from Osama Bin Laden. Prosecutors have said that Kashmiri maintains close ties with at least one Al-Qaeda leader.

According to the complaint, Khan sent $950 from a currency exchange in Chicago to “Lala,” a name meaning older brother that he used in speaking of Kashmiri. It said the money was sent after Kashmiri indicated to Khan that he needed cash to buy explosives.

On March 17, Khan accepted $1,000 from the undercover agent and assured him that the money would be used to purchase weapons and possibly other supplies, the complaint said.