(NBC NEWS) As debate grows over the extremism of some armed factions battling to overthrow Syrian President Bashar Assad’s regime, an incendiary illustration on the Facebook page of one such group leaves little doubt where its leaders envision the uprising ending – with masked Islamic fighters marching through Washington, D.C., as the U.S. Capitol burns in the background.

The image is one of eight photos posted on the official Facebook page of the “Al-Aqsa Islamic Brigades,”  a small armed Sunni rebel faction fighting with the Free Syrian Army, the main umbrella military organization of the opposition forces. Two other photos posted on the group’s page feature the widely recognized black flag of the al Qaeda in Iraq terrorist group, which operates freely in Syria.

 Evan Kohlmann, a senior partner with the security firm Flashpoint Intelligence and an NBC consultant on terrorism, who discovered the image on Facebook and provided it to NBC News’ investigative unit, said Al-Aqsa has not been designated as a terrorist group by the United States. But he noted that it fights alongside another Free Syrian Army force, the Tawhid Brigade, that has been linked to Jabhat al-Nusra, one of two rebel factions labeled terrorist groups by the U.S. government.

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