Canadians sometimes speak a bit funny. Americans think we say ā€œabootā€ instead of ā€œabout,ā€ for example, because of something called a .

Itā€™s this type of subtle idiosyncrasy in our speech that leads one linguistics professor to believe an Islamic State militant -- one seen executing Syrian soldiers on video --  is from Canada.

At one point during an hour-long ISIS propaganda video released last month, a man is shown speaking in both Arabic and English as he brags about making Syrian soldiers dig their own graves.

Apart from his eyes, the man has his face completely covered. But as he threatens the camera, thereā€™s one thing he canā€™t hide ā€“ his accent.

ā€œThere are certain clues in the words he uses that suggest he has at least some kind of Canadian exposure,ā€ says Jack Chambers, a linguistics professor from the University of Toronto.

When the jihadist points to a pock-marked building and talks about the ā€œbullet holes and artillery shells from the Islamic State,ā€ Chambers says the man pronounces ā€œIslamicā€ the way 75 per cent of Canadians do.

And when he says heā€™s ā€œoutsideā€ the city of Ar-Raqqah, he says it with that raised Canadian vowel.

Darren Flynn, another linguist from the University of Calgary, agrees the accent is North American. And though he isnā€™t certain the speech patterns are specifically Canadian, Flynn says the way the man speaks reveals a lot about him.

ā€œYou can tell that he's definitely not working class,ā€ he says. ā€œHe's from the north. He could be either on this side of the border or the American side.ā€

The FBI has asking for information from anyone who might know the manā€™s identity.

Itā€™s a search that Canadians should be taking seriously, says Lorne Dawson, a University of Waterloo professor whose areas of study include religion and radicalization.

ā€œWe donā€™t have the same attitudes as people in England, Denmark, the Netherlands and even the United States in terms of being prepared,ā€ Dawson told Ā鶹“«Ć½.

ā€œWe havenā€™t had many incidents in Canada ā€“ terrorist incidents ā€“ but thereā€™s a kind of rising tide of this activity, and I think itā€™s just a matter of time before something regrettable happens here.ā€

With a report from Ā鶹“«Ć½ā€™ Laurie Graham