It says the crematorium is being used to hide evidence of the extent of the killings.
It's never a bad time to look back at all of the Western officials and opinion leaders who assured us that Assad was the kind of leader who deserved America's extended hand of friendship and trust.
And he said he hoped to work with Putin, whose forces are in Syria to protect Assad's regime, in this goal.
The US has been sidelined from talks in Astana, where most of the significant agreements of the six-year-war have been made.
Attributing new revelations about the "the depths to which the Syrian regime has gone with the continuing support of its allies, Russian Federation and Iran", to newly declassified reporting, Acting Assistant Secretary for the Bureau of Near Eastern Affairs Stuart Jones said that the regime had installed a crematorium at a notorious prison north of Damascus to dispose of the bodies of prisoners killed there, in a briefing to reporters Monday.
The prison is believed to kill at least 50 detainees a day often by mass hangings, acting assistant Secretary for Middle Eastern Affairs Stuart Jones briefed reporters on Monday.
"We now believe that the Syrian regime has installed a crematorium in the Saydnaya prison complex that could dispose of detainees' remains with little evidence", Jones said.
"We believe that the building of a crematorium is an effort to cover up the extent of mass murders taking place in Saydnaya prison", said Stuart Jones, the top U.S. diplomat for the Middle East.
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In February, Amnesty International said that no less than 13,000 prisoners have been hanged in Saydnaya prison in the five years since the start of the revolt and subsequent civil conflict in 2011.
"We are appalled by the atrocities carried out by the Assad regime", he said. "We are appalled by the atrocities taking place in Syria" with the "seemingly unconditional support of Russian Federation".
The Trump administration, which distributed new satellite images to the press, says the regime modified a building on its Saydnaya prison complex into a crematorium in 2013. Both sides, he said at the time, want to end the "the frightful, disgusting killing in Syria as soon as possible, and everybody is working toward that end".
"We demand that the Syrian authorities immediately cease extrajudicial executions and torture and inhuman treatment at Saydnaya Prison and in all other government prisons across Syria".
He called on both countries to use their influence with Syria to establish a credible ceasefire, and begin political talks.
"I think the question is what about sequencing", Stein said. After last month's attack in northern Syria, Trump said the Syrians crossed "a lot of lines" for his administration.
But relations with Moscow, already dire under Trump's predecessor Barack Obama, have not improved and Assad has continued to bombard civilian areas in his battle with opposition rebels. The evidence on the crematorium was assembled through local non-governmental organization groups, intelligence community assessments and press reporting, he said.
"I am encouraged by the increasing engagement, increasing interest by the United States administration in finding a de-escalation, a reduction of violence", de Mistura said.