New Delhi: The ISIS recently released a 55-minute video called the 'Flames of War' warning the United States of the consequences for being an impediment in the terror group's goal to create an Islamic caliphate in parts of Iraq and Syria.
The video also praised the victories of the ISIS or the Islamic State.
However, what has caught the attention of American intelligence agencies is the man who appears briefly at the end of the video.
This so-called ISIS fighter speaks perfect English and is said to have a North American accent. He is shown directing the mass execution of a group of men.
As per CNN Reports, as of now it is too early to say whether the militant hails from North America or if he spent some time in that part of the world.
The investigating authorities are analysing the video in order to identify the man's origin.
A US official was quoted by CNN as saying that it was too early to tell where his dialect was from.
In the video, the man is said to first appear on the screen speaking Arabic in a typical dialect. Later the man effortlessly switches to English.
He is said to be masked and wearing a camouflage uniform in the video and there are number of men digging a ditch behind him.
As per reports the militant claims that they are Syrian soldiers assigned to a 17th division military base near the Syrian city of Raqqa. He then goes on to say that the men, after an ISIS attack, are digging their own graves.
Whether the men in the video were soldiers or not has not been verified as yet.
Those men are then executed by a group of militants.
It is also being said that the man in the film could be an Arab who was educated in the West. Or may be an American or Canadian.
Various reports have suggested that the ISIS are the richest terrorist group in history and oil smuggling, human trafficking, theft and extortion are some of their source of income.
As of now, their total worth is reportedly well over £2 billion.
The ISIS expanded during the civil war in Syria. It swept into Iraq in June this year, seizing large areas of the country's Sunni-dominated northern and western provinces.