File Photo: IS militants sit on a tank during a parade in Raqqa, Syria (Photo: AP)
Heavy U.S.-led air strikes in northeastern Syria killed at least 170 Islamic State militants in a 48-hour period earlier this week, the Syrian Observatory for Human Rights reported overnight.
The U.S.-led alliance has been coordinating its air campaign in the northeastern province of Hasaka with Syrian Kurdish YPG militia, which is fighting Islamic State on the ground there.
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