U.S.: It's unclear if Russia has stopped using Iranian air base

The U.S. State Department said on Monday it had seen reports that Russia had ended its use of an Iranian air base to carry out strikes in Syria, but said it was not clear whether Russian use of the base actually had stopped, Reuters reports.

Last week, the Defense Ministry in Moscow announced that Russian warplanes had flown out from an Iranian air base to conduct strikes against jihadist groups in war-torn Syria.