The Federal Bureau of Investigation (FBI) is enlisting the public's help in identifying a masked Islamic State (ISIL) fighter in a propagandist video clip uploaded on social media last month.

The 55-minute video titled "Flames of War" and released on Sept. 19 shows a masked man seamlessly alternating between speaking English with a North American accent and Arabic in front of Syrian soldiers digging their own graves.

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The fighter, speaking with pro-ISIL pronouncements, had later presided over the soldiers' executions, according to ABC News.

The FBI believes the video was intended to appeal to a Western audience.

FBI Director James Comey said the bureau was focusing efforts on identifying the ISIL fighter. He called on the public to help identify the masked man and other individuals with plans to join the ISIL in the Middle East.

FBI's Counterterrorism Division assistant director Michael Steinbach said he hopes the public will be able to provide key information on the masked individual.

"No piece of information is too small," he added.

The FBI's drive to quash the ISIL threat has also provided for a specific tip line to bring an end to the surge of volunteers fleeing the country to Iraq and Syria. To date, around 100 Americans are believed to have joined a number of extremist groups in the region, with about 12 people or so estimated to have joined the ISIL, the FBI said.

The bureau's appeal comes days after a Chicago teen was arrested after allegedly preparing to travel to Syria to join the ISIL.

Authorities on Saturday arrested 19-year-old Mohammed Hamza Khan - a U.S. citizen -at the O'Hare International Airport just before boarding a plane headed to Vienna en route to Turkey.

Last month, security officials said they had identified the British-accented masked ISIL fighter nicknamed "Jihadi John" who had appeared in videos in the beheading of British aid worker Alan Henning and American journalists James Foley and Steven Sotloff.

TagsISIL, Alan Henning, Islamic terrorism, Spies, Federal Bureau of Investigation