The United Nations said it has provided information and evidence to 12 national jurisdictions regarding war crimes in Syria, including video footage, photographs, via satellite and "leaked documents."

Catherine Marchi-Uhl, head of the mechanism established by the United Nations to ensure that justice is achieved in relation to war crimes in Syria, revealed that the evidence she presented also included witness accounts and forensic evidence samples, and that this represents "the best position documented since the end of World War II."

Marchi-Uhl headed an impartial and independent international mechanism that investigates the most serious crimes committed in Syria, and her statements came in conjunction with the passage of 10 years since the beginning of the Syrian revolution.

Marchie-Uhle, a former French judge, told a forum hosted by Britain that this "does not make the path to justice easy, but it makes it possible."

She stated that her small team in Geneva was establishing a headquarters to store large quantities of evidence and information, and strengthened it in line with international criminal law standards.

"We cooperate with 12 different judicial authorities, and support investigations and prosecutions with them. We have received 100 requests for assistance in connection with conducting 84 investigations and prosecutions," she added, noting that the mechanism exchanged information and evidence with 39 investigations out of 100.

Marchi-Uhl later explained to Reuters that "a large portion in Europe" included 12 of these jurisdictions.

Last month, a German court in the city of Koblenz sentenced a former member of the security services loyal to Syrian President Bashar al-Assad to 4 and a half years in prison for facilitating the torture of civilians, in the first conviction for crimes against humanity in the Syrian war.

"So far, the investigation committee has collected preliminary information on 3,200 suspected perpetrators," the head of the United Nations Commission of Inquiry on Syria Paulo Pinheiro - a separate committee of war crime investigators affiliated with the international organization that maintains a confidential list of suspects - told the forum.

"This includes individuals from all parties to the conflict, including the government, pro-government forces, anti-government armed groups, and organizations listed by the United Nations on the terrorist list, including the Headquarters for the Liberation of Al-Sham and ISIS (ISIS)," he added.