Ankara has expressed its strong reaction to the U.S. envoy over a U.S. State Department statement of conditional condemnation following the killing of 13 Turkish citizens by the PKK in northern Iraq, Hurriyet newspaper cited the ministry as saying.

Turkish officials on Sunday announced that 13 Turks, including military and police personnel, had been executed by the outlawed group amid a military operation targeting the organization in the Gare region of northern Iraq.

Last week, the militants warned that the hostages’ lives were under threat from a Turkish military bombardment of a camp in the region.

The U.S. State Department's condemnation the killings on Sunday questioned whether the PKK was behind the killings.

''If reports of the death of Turkish civilians at the hands of the PKK, a designated terrorist organization, are confirmed, we condemn this action in the strongest possible terms,” Ned Price, spokesman for the U.S. State Department, said in a statement.

Earlier on Monday, Erdogan said it was time for the United States to stop supporting "terrorist groups" during a televised speech in his home city of Rize in northeast Turkey, Ahval reported.

“The U.S. has given them weapons and they have fought against us,” Erdogan said. “If we are going to be together within NATO, you will side with us, not terrorists.”

“There is a statement made by the United States, it is something else,’’ Tele1 news site cited Erdogan as saying, referring to Price’s statement. “Was it not the case that you are not on the side of the PKK and the YPG? You are most certainly are on their side and behind them.’’

Turkey considers the Syrian People’s Protection Units (YPG) to be a terrorist organization, due to alleged ties with PKK, an armed group that has fought for Kurdish self-rule in Turkey since the 1980s. YPG, acting as the armed forces of the Kurdish-led Syrian Democratic Forces (SDF), was a key element in the fight against the Islamic State (ISIS) under the U.S.-led international coalition.

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