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More than 300 Islamic State militants who are holed up in a tiny area in eastern Syria are refusing to surrender to U.S.-backed Syrian forces and are trying to negotiate an exit.

READ MORE: Cornered ISIS militants holding 1,000 civilians in Syrian village, U.S.-backed militia says

A person familiar with the negotiations says the militants are asking for a corridor to the rebel-held northwestern province of Idlib. He spoke on condition of anonymity because he was not authorized to speak about the talks, which he described as taking place indirectly.

The Britain-based Syrian Observatory for Human Rights, an activist group that monitors the civil war in Syria, says another request by the Islamic State group to be evacuated to neighbouring Iraq was also rejected.

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The militants are making their last stand in eastern Syria, hiding among hundreds of civilians.

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WATCH: ISIS clinging to last stronghold in eastern Syria.

1:09 ISIS clinging to last stronghold as dozens surrender ISIS clinging to last stronghold as dozens surrender