There is one slight problem; they were printed backwards and upside down, a possible sign this is a hoax. I don't think a serious jihadist would make such a juvenile mistake, yet it must be considered as a remote possibility. If it is true, it would indicate someone with access to the base, and that possibility is distressing.
From PJMedia October 30
Possible Islamic State Leaflets Found in Quantico Marine Base
Leaflets found at the site of the Marine Corps headquarters in Quantico, Virginia, Wednesday may have ties to the international terrorist organization ISIS, a source told the Tatler today. The leaflets, which portray the flag of the Islamic State, include a message in Arabic that says “We came from Mexico on a train.”
The leaflets raise the questions of whether the Islamic State has operatives in the heart of the United State’s Marine Corps headquarters, or alternatively, whether someone is testing security responses and military command communications.
The Tatler obtained a digital copy of the leaflet today, which is being distributed within the Marine Corps command. The source, who requested anonymity, wrote:
MCB Quantico personnel found 6-7 of these leaflets in Quantico Town (the shopping/residential area inside of Marine Corps Base Quantico) this afternoon (Wednesday). The picture depicts an ISIL banner. The translation of the writing is “We came from Mexico on a train.”
Marine Corps commands in the National Capital region have been informed and are increasing situational awareness at their installations.
The leaflet is being investigated by the Marine Corps, the FBI and Navy intelligence. The Tatler contacted public affairs at Quantico, but as of publication time the base has not commented.
The Tatler has had the inscription independently translated. It says: “We are here from Mexico. We took the train.” Coupled with the ISIS flag, it is clearly intended to be a threat, connected to the porous U.S.-Mexico border.
But the ISIS flag is upside down and reversed with respect to the Arabic text.
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