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Foreign fighters are flowing into to Syria, some radicalizing Syrian rebels, the UN said on Monday.
United Nations human rights investigators said on Monday there is evidence that points to the increased presence of radical foreign fighters within the ranks of the Free Syrian Army, the Associated Press reported.
Paulo Pinheiro, leader of the UN inquiry into Syria's civil war, said he was concerned about the new development.
"Such elements tend to push anti-government fighters towards more radical positions," he said during a meeting of the UN Human Rights Council, according to the AP.
The UN statements come a day after a commander of Iran's Revolutionary Guard Corps said that Iranian forces were involved in the conflict, according to the Washington Post.
The commander said soldiers in its Quds Force were working in Syria to support the regime of President Bashar al-Assad, according to the Post. He said these members were not involved in direct combat.
However, Iran's foreign ministry on Monday denied those claims, Reuters reported, citing Al Alam television.
“Reports by some Arabic and Western media, citing ... Jafari were selective, false and with political aims,” Foreign Ministry spokesman Ramin Mehmanparast told the Iranian television station, according to Reuters. “Iran has no military presence in the region, especially in Syria.”
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The UN has also said that it has the names of people it believes may be responsible for human rights violations and war crimes, The New York Times reported.
"A second confidential list of individuals and units believed to be responsible for violations is being provided to the High Commissioner of Human Rights," Pinheiro told the council, according to Al Jazeera.
The UN says it has evidence, "reasonable grounds," that prove Assad's government forces, pro-Assad militia groups and Free Syrian Army rebels have violated human rights and committed war crimes.