Fighting has cooled in recent years after Iran and Russia helped Assad recapture 70 percent of Syrian territory, the United States backed Kurdish fighters that defeated Islamic State militants, and Turkey set up a buffer zone near its border. But the United Nations said fault lines between various areas are now starting to heat up again.
"We had an idea at some point that the war was completely finished in Syria," Pinheiro told journalists in Geneva, adding that incidents documented in the report proved this was not the case.
The 50-page report found that "grave violations of fundamental human rights and humanitarian law" had increased across the country in the first six months of this year.
The UN has said more people are in need in Syria than ever before, as an economic crisis further strains their ability to access basic goods and services.
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