Story highlights The six suspects include a husband and wife

They were arrested this month in Illinois and St. Louis, according to court records

(CNN) Six suspects linked to terrorist activity referred to Syria and Iraq as "the beach," and used other coded language to avoid detection in the United States, authorities say.

The Bosnian immigrants, including a husband and a wife, were arrested this month in Illinois and St. Louis , according to court records released Friday. Three of the suspects are naturalized American citizens.

A federal indictment alleges they communicated via social media and conspired to send money and military equipment to terrorists in Syria and Iraq. They allegedly shipped firearms accessories, military uniforms and combat boots through intermediaries in Turkey.

Suspects named in the indictment are Nihad Rosic, Armin Harcevic, and married couple Ramiz and Sedina Hodzic, all from St. Louis, along with Illinois residents Mediha Salkicevic and Jasminka Ramic.

They face various charges, including conspiracy to kill, and sending money and weapons to terrorists, the indictment shows.

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