Omran Daqneesh, 5, sits in an ambulance after being pulled out of a building hit by an airstirke, in Aleppo, Syria, Wednesday, Aug. 17, 2016.

The brother of the Syrian boy whose picture has become a symbol of civilian suffering in war-torn Aleppo has reportedly died on Saturday from injuries sustained during the airstrike.

Ali Daqneesh, 10, was injured alongside his little brother Omran and the rest of their family, when an airstrike destroyed their apartment building late Wednesday.

Ali was taken to a hospital with the other family members, but died of his injuries on Saturday, activists in Aleppo said.

The UK-based Syrian Solidarity Campaign also reported his death on their Facebook page, labeling the attack a “war crime,” and calling for a halt to bombings.

Abu Ali, the children’s father, said his son was outside in the street playing with friends near their home when the airstrike hit the building.

He described how he was sitting on the sofa next to Omran at the time, with the rest of the family elsewhere in the flat.

“It is very painful to watch your children falling in front of your eyes,” he said in an interview with UK daily The Telegraph.

Images of fiver-year-old Omran sitting in an ambulance – covered in dust and blood – spread around the world and trigerring calls for an immediate ceasefire.

“The sad reality is that Ali is not the first child to have been killed, and probably not the last,” Nada Hashem, co-founder of the How Many More campaign that is dedicated to preserving the memory of the Syrian people who have been killed in the conflict, told Al Arabiya English.

In March 2015, Hashem said she and other activists stood in front of the White House and read the names of the over 20,000 children who were killed in Syria

“That was well over a year ago. I’m sure the number is much higher now as we’ve seen the death toll double and triple and quadruple over the years. Probably in the time that I’m speaking to you , at least another child has died,” she said.

According to UNICEF’s latest figures, there are 6 million children inside the country who are impacted by the war. Additionally, there are a further 2.2 million children living as refugees in neighboring countries – that’s more than 8 million children – 80 per cent of Syria’s population of children and young people aged under 18.

“The constant reality is that for every Omran that survives , there are many Alis who die,” Hashem said.

A general view shows the site of yesterday’s airstrike where five-year-old Omran Daqneesh got injured in the rebel-held al-Qaterji neighbourhood of Aleppo, Syria August 18, 2016. The Daqneesh family lived in the building on the left.