The Turkish army said on Thursday that Russian airstrikes accidentally killed three Turkish soldiers and wounded 11 others in an anti-ISIS operation in northern Syria. Russia later confirmed its warplanes had carried out the botched strike.
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Russian President Vladimir Putin expressed his condolences to his Turkish counterpart Tayyip Erdogan in a phone call, the Kremlin said.
It said in a statement that the incident had taken place near the ISIS-held city of al-Bab in northern Syria.
Turkish-backed Syrian opposition fighters resumed a major offensive inside the city on Thursday, a day after they broke through ISIS defenses in its remaining stronghold in Aleppo province.