"We are asking for the United States and the UN to intervene to immediately lift the medicine and food blockade" of Camp Liberty, said Maryam Radjavi, who heads the France-based National Council of Resistance of Iran.
Camp Liberty, a former US military base, houses some 3,800 members of Iran's main opposition group, the People's Mujahedeen Organisation of Iran (PMOI).
Speaking on the sidelines of the UN Human Rights Council in Geneva, Radjavi also regretted the increased "harassment, intimidations and provocations by Iraqi security forces" of those inside the camp.
Washington, the EU and the UN should ask the UN Security Council to examine the situation in the camp "to avoid another humanitarian catastrophe," she insisted.
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Jean Ziegler, a Swiss consultant to the Human Rights Council who also spoke at Friday's conference, said the blockade of Camp Liberty was "a war crime, because they are starving civilians".
"These people risk dying," he said, calling for UN observers and peacekeepers to be sent to the camp.
The Iraqi government blames the violence on PMOI in-fighting but the exiles attribute it to the Baghdad government, which they believe launched the assault at the demand of Tehran.
Radjavi today reiterated PMOI's call for an "independent investigation" into the killings to prevent any "repetition of such crimes".
Scores of PMOI members have been killed in more than a dozen attacks on their camps since US troops withdrew from Iraq at the end of 2011.