Mohammed Katta's mother witnessed “execution” of her young kid in three stages.

She was upstairs at home when she first heard the shouting. People of the neighborhood were yelling that "they have brought back the kid", so she rushed out of her apartment.

"I went out on my balcony," Nadia told a Daily Telegraph reporter.

"I said to his father, they are going to shoot your son! Come! Come! Come! I was on the stairs when I heard the first shot. I was at the door when I heard the second shot.

"I saw the third shot. I was shouting, 'That's haram, forbidden! Stop! Stop! You are killing a child.' But they just gave me a dirty look and got into their car. As they went, they drove over my son's arm, as he lay there dying."

Mohammed was 14 when he was killed, earlier this month.

After he was taken by militants he was harshly lashed before they killed him by shooting in his mouth and neck.

Mohammed has become a symbol of the fears many Syrians have for the future of a country where extremists are vying with each other for control.

As the ongoing foreign-backed insurgency in Syria continues to get bloodier, US government is boosting its political and military support to the anti-government insurgents.

Washington has remained indifferent about warnings by Russia and Syrian government about consequences of arming these militant groups which would give them more power in Syria.