(CNN) -- After 18 months of terror and grave devastation, Syrian children are plagued with trauma from witnessing the horrors of war first-hand, an international aid group says.
Save the Children released a report Tuesday called "Untold Atrocities," a collection of accounts from Syrian refugee children.
"A massacre took place in my village. Around 25 people were killed -- I witnessed it with my own eyes," said 15-year-old Mohamad, who has fled to Jordan with his family. "They used different ways to kill people -- electric shocks, throwing machinery and cement blocks on people's heads."
Hassan, 14, described the use of children as human shields -- akin to reports from opposition activists that the Syrian regime has used children as shields.
He said his cousin and uncle died when a rocket "caused a massacre."
"Almost every child we've spoken to has seen family members killed," Save the Children said.
Even those who survive attacks face dire circumstances.
"When we were being bombed we had nothing. No food, no water, no toys -- nothing. There was no way to buy food -- the markets and shops were bombed out," 10-year-old Ala'a said. "My father went without food for days because there wasn't enough. I remember watching him tie his stomach with rope so he wouldn't feel so hungry."
Wael, 16, summarized the trauma this way:
"I have seen children slaughtered. I don't think I'll ever be OK again."
In other developments:
On the ground: Blasts strike a Damascus compound
Dual attacks rattled a Syrian intelligence security compound in Damascus, the regime and opposition activists said Tuesday.
The compound was also the site of a major explosion in March.
Syrian state-run TV said the two improvised explosive devices were "planted by terrorists" in a school building and caused seven injuries.
Opposition activists said the Syrian military was using the school building as a base. The new school year has not yet started, Syrian state TV said, so it seems unlikely that children would have been at the site.
In June, Human Rights Watch described cases of "sexual torture" at the compound, reported by male and female detainees -- many of whom were political activists or simply attended protests.
At least 50 people have been killed across Syria on Tuesday, according to the Local Coordination Committees of Syria, an opposition group.
Thirteen deaths have been reported in Daraa province, where regime forces are dropping improvised explosive barrels from helicopter gunships above the city of Daeel, according to the LCC.
Diplomatic front: Obama pledges support, Qatar offers a new plan for Syria
President Obama used his speech at the United Nations General Assembly on Tuesday to pledge U.S. support for those working for a "common good" for Syria, and sanctions against those doing harm.
"In Syria, the future must not belong to a dictator who massacres his people," he said.
"If there is a cause that cries out for protest in the world today, it is a regime that tortures children and shoots rockets at apartment buildings. And we must remain engaged to assure that what began with citizens demanding their rights does not end in a cycle of sectarian violence.
"Together, we must stand with those Syrians who believe in a different vision -- a Syria that is united and inclusive."
There would be consequences and sanctions for those who persecute others, Obama promised, and assistance for those who work for the good of all of Syria's people.
The U.S. president's words come a day after Qatar's prime minister proposed a "Plan B" for solving the Syrian crisis, saying a nonviolent solution is still possible despite more than a year of relentless bloodshed. He called for greater help from the United States to achieve this end.
In an interview with CNN's Christiane Amanpour, Prime Minister Sheikh Hamad bin Jassim Al Thani said the plan would include havens -- which would require a no-fly zone -- and greater humanitarian aid.
"We wish and we believe that we can solve it peacefully," Al Thani said Monday. But, he said, Syrian President Bashar al-Assad has only one solution: "killing his people to win the war."
"I believe within weeks, we should have a Plan B. And there is a responsibility among us," he said. "We are talking about saving the people of Syria."
When asked who would participate in the plan, Al Thani replied, "I believe there is a lot of Arab countries will participate, and there is also European countries will participate."
But what the plan really needs, Al Thani said, is help from the United States.
"I know, to be more frank, that there is an election now. ... But I hope that after the election, the American government looks at this matter in a different way. And I always meant no military intervention, but we need to take some measures ... to save the Syrian people."
The prime minister said his country is not providing weapons to Syrian rebels, but is giving humanitarian aid to refugees who have fled to other countries.
Al Thani said he hopes plans for Syria don't include a regional struggle between Sunni and Shia Muslims.
"My fear (is) that if there is a Sunni-Shia war and escalation ... nobody will win in this."
He also alluded to the diplomatic deadlock at the U.N. Security Council, where Russia and China have repeatedly blocked draft resolutions that would take stronger action against al-Assad's regime.
"I really hope that Russia and China join all of us to find a solution. Not exactly what they want or what we want -- it's exactly what the Syrian people want, in my opinion."
Qatar played a key role in the revolution in Libya as the first Arab nation to recognize the rebels and support NATO's mission there.
In fact, Libyans were so thankful, they hung the Qatari flag over a compound of longtime dictator Moammar Gadhafi in Tripoli.
But Al Thani says that was possible through work via NATO and the help of the United States.
CNN's Saad Abedine, Holly Yan, Samuel Burke and Claire Calzonetti contributed to this report.