An international war crimes prosecutor, Stephen Rapp, said evidence emerging from mass grave sites in Syria has exposed a state-run “machinery of death” under toppled leader Bashar al-Assad.

According to Mr Rapp, more than 100,000 people have been tortured and murdered since 2013.

Speaking after visiting two mass grave sites in the towns of Qutayfah and Najha near Damascus, former U.S. war crimes ambassador at large Stephen Rapp said, “We certainly have more than 100,000 people that were disappeared into and tortured to death in this machine.

“I don’t have much doubt about those kinds of numbers given what we’ve seen in these mass graves. We haven’t seen anything quite like this since the Nazis.’’

Mr Rapp led prosecutions at the Rwanda and Sierra Leone war crimes tribunals and is working with Syrian civil society to document war crimes evidence and also helping to prepare for any eventual trials.

He added, “From the secret police who disappeared people from their streets and homes, to the jailers and interrogators who starved and tortured them to death, to the truck drivers and bulldozer drivers who hid their bodies, thousands of people were working in this system of killing.

“We are talking about a system of state terror, which became a machinery of death.”

Hundreds of thousands of Syrians are estimated to have been killed since 2011 when Mr Assad’s crackdown on protests against him spiralled into a full-scale war.

Both Mr Assad and his father, Mr Hafez, who preceded him as president and died in the year 2000, have long been accused by rights groups and governments of widespread extrajudicial killings, including mass executions within the country’s prison system and using chemical weapons against the Syrian people.

Mr Assad, who fled to Moscow, had repeatedly denied that his government committed human rights violations and painted his detractors as extremists.

The head of U.S.-based Syrian advocacy organisation, the Syrian Emergency Task Force, Mouaz Moustafa, who also visited Qutayfah, 25 miles (40 km) north of Damascus, has estimated at least 100,000 bodies were buried there alone.

The International Commission on Missing Persons in The Hague separately said it had received data indicating there may be as many as 66, as yet unverified, mass grave sites in Syria. More than 157,000 people have been reported missing to the commission.

Commission head Kathryne Bomberger told Reuters its portal for reporting the missing was now “exploding” with new contacts from families.

By comparison, roughly 40,000 people went missing during the Balkan wars of the 1990s.

Ms Bomberger said searching for the truth in Syria could be long and difficult for the families. A DNA match will require at least three relatives to provide DNA reference samples and take a DNA sample from each skeletal remains found in the graves.

The commission called for sites to be protected so that evidence was preserved for potential trials, but the mass grave sites were easily accessible on Tuesday.

The U.S. State Department is engaged with several UN bodies to ensure that the Syrian people receive answers and accountability.

Syrian residents living near Qutayfah, a former military base where one of the sites was located, and a cemetery in Najha used to hide bodies from detention sites described seeing a steady stream of refrigeration trucks delivering bodies that were dumped into long trenches dug with bulldozers.

(Reuters/NAN)