The older brother of a Syrian boy whose image, dazed and bloodied after an air strike, shocked people around the world, has died in Aleppo from wounds sustained in the same incident, a war monitor, a local council official and a witness said.

Ali Daqneesh, 10, was wounded in Wednesday's air strike, according to U.K.-based monitoring group the Syrian Observatory for Human Rights, and a witness who was present at the time of the death along with the boys' father.

"He was martyred while in hospital as a result of the same bombardment that their house was subjected to," said Besher Hawi, the spokesman for the local council of Aleppo.

He had internal bleeding and organ damage, doctors told the witness.

His younger brother, five-year-old Omran Daqneesh, was pictured in the back of an ambulance after being pulled from the rubble, with an expression of incomprehension on his dust- and blood-caked face.

The video and pictures were widely circulated online and in the media, refocusing public opinion on Syria's five-year-old war and the plight of civilians, particularly in Aleppo.

Russian and Syrian regime warplanes have intensified their air strikes on the opposition-held east of the city since opposition forces made an advance last month, breaking an effective siege.

Fighting and air strikes in and around Aleppo have killed 448 civilians so far this month, the Observatory said.

PHOTO CAPTION

Five-year-old Omran Daqneesh, with bloodied face, sits inside an ambulance after he was rescued following an airstrike in the opposition-held al-Qaterji neighborhood of Aleppo, Syria August 17, 2016.

Reuters