Islamic State fighters wrested areas of the northeastern Syrian city of Hasaka from government control in fighting overnight, the Syrian Observatory for Human Rights monitoring organization said on Thursday.
A Syrian military source denied the report, saying the army had repelled the attack.
The city of Hasaka is divided into zones controlled separately by the Damascus government and a Kurdish administration whose well-organized militia has been on the offensive against Islamic State, making significant gains against the group in its stronghold of Raqqa province.
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