WASHINGTON (CBSDC) — The Islamic State of Iraq and Syria reportedly has the capability to print fake passports with their own machines.

ABC News reports a 17-page Homeland Security Investigations Intelligence Report reveals that ISIS has been able to print authentic-looking passports since taking over the Syrian city of Deir ez-Zour last summer. The city houses a passport office and printing machine.

“Since more than 17 months [have] passed since Raqqa and Deir ez-Zour fell to ISIS, it is possible that individuals from Syria with passports ‘issued’ in these ISIS controlled cities or who had passport blanks, may have traveled to the U.S.,” the report reads, according to ABC News.

FBI Director James Comey told Congress Wednesday during a hearing that he is concerned about the terror group obtaining fake passports.

“The intelligence community is concerned that they have the ability, the capability to manufacture fraudulent passports, which is a concern in any setting,” he told lawmakers.

According to ABC News, the report also states that Syria is flooded with fake documents.

“The source further stated that fake Syrian passports are so prevalent in Syria that Syrians do not even view possessing them as illegal,” the report reads. “The source stated fake Syrian passports can be obtained in Syria for $200 to $400 and that backdated passport stamps to be placed in the passport cost the same.”

The report concludes: “If ISIS ability to produce passports is not controlled, their operations will continue to increase and expand outside of their operational controlled areas.”

The U.S. and its allies have been conducting air strikes against ISIS in Iraq and Syria. The U.S. is also sending in more special operations forces to the two countries.