A report by British charity Save the Children has documented cases of abuse and violence against children in Syria.
The 18-month conflict has left thousands of children dead and many more have been forced to flee to refugee camps in neighbouring countries.
The report compiles 18 first-hand accounts from Syrian refugee children.
It shows that a boy witnessed his family members being killed when a rocket fell on a funeral procession.
Another account comes from a teenager who was imprisoned and tortured in his own school, which was transformed into a mass detention centre for children by Bashar al-Assad’s regime.
The group did not always specify which side had committed the alleged acts.
It said: "Every crime against children must be recorded to send a clear message to all sides in the conflict that these atrocities will not be tolerated."
Among the accounts in "Untold Atrocities: The Stories of Syria's Children": Hassan, a 14-year-old boy now living in a refugee camp in Jordan, described what happened when a rocket landed in a funeral procession in his home village.
"Dead bodies along with injured people were scattered on the ground," he said.
"I found body parts all over each other. Dogs were eating the dead bodies for two days after the massacre."
Hassan also claimed that government soldiers used children as human shields.
He said: "Another thing they do is to use children to protect themselves.
"They know we can't shoot our own children, so they put the children in front - so they're a human shield - and march into our villages. It's terrifying for the children. Many of them die."
Like most of the accounts in the report, Hassan's account omitted the time and place of the events and other details that could identify him.
The group said however that testimonies corroborate other stories gathered by the UN and rights groups, describing the acts as "consistent, recurring and appalling".
These allegations have included the abduction, torture and even killing of children by government forces to punish their parents.
Khaled, 15, described how a group of men came to his village, arresting him and 100 others, one as young as 12.
He was taken to the local school and held there for a week. His captors hanged him from the ceiling by his wrists with his feet off of the ground, stubbed out their cigarettes on his skin, and beat him.
"They took me there to torture me, in the same place I used to go to school to learn. My father was actually the principal there," he said. "When I realised that was where we were going, I was so sad, I wanted to cry."
Wael, 16, was also caught up in a mass detention. He said the captors were especially cruel to a six-year-old boy, Alaa, because his father was wanted by the regime of President Assad. Alaa was tortured and denied food and water for three days.
"I watched him die. He only survived for three days and then he simply died," Wael said. "He was terrified all the time. They treated his body as though he was a dog."
In its recommendations, Save the Children urged the United Nations to increase its presence on the ground to document violations.
The Security Council decided last month to end a 300-member UN military observer mission that was sent to monitor a cease-fire that never took hold, replacing it with a small liaison office that will support any future peace moves.
