The head of the Syrian Observatory for Human Rights, Rami Abdurrahman, told Efe that the British Emwazi Mohamed, known as "Jihadi John", "probably dead", but did not confirm his death.
In a telephone conversation with Efe, the director of the NGO said that their hospital sources the Syrian city of Al Raqa informed him that "lean" by the possibility that a body received today is the executioner of the terrorist group Islamic State (EI).
Military sources told the BBC that a "high degree of certainty," the "Jihadi John" died in an attack that took place today near the town of Al Raqa, in northern Syria.
According to the British public broadcaster, Emwazi and another person who was with him were killed when US forces attacked the vehicle in which the two were in Al Raqa.
However, British Prime Minister David Cameron said today that there is still no certainty that Emwazi has died.
Born in Kuwait in 1988, the "Jihadi John" appeared in videos of EI in the killings of American journalists Steven Sotloff and James Foley, the US aid Kassig Abdul-Rahman, the British David Haines and Alan and Henning were Japanese journalist Kenji Goto.
The "Jihadi John" caught the attention of the secret services in August 2014, when the jihadist group released a video that appeared hooded and slaughtered on camera James Foley, especially for his strong cockney.