terrorist group overseas according to court documents. investigators say later communications revealed the two men began coordinating travel to turkey often seen as a gateway into syria by foreign fighters. >> to prove a conspiracy, you only have to show that there's been a material effort or forward step in furtherance of the conspiracy. clearly those communications would indicate that there's been a forward step in the conspiracy. >> reporter: in court documents released both suspects are accused of purchasing roundtrip tickets to turkey with the help of their friend who allegedly provided more than $1,000 for their travel. one of the men told a confidential informant if he was detect detected at the airport, they could kill police officer and use the officer's gun to shoot other law enforcement officers that arrived on scene. pamela brown, cnn, washington. a syrian rights activist