In the early morning of 25 April 2017, the Turkish Air Force conducted multiple airstrikes against media centers and headquarters of the People's Protection Units (YPG) and the Women's Protection Units (YPJ) in northeastern Syria, and against positions of the Sinjar Resistance Units (YBŞ) on Mount Sinjar, northwestern Iraq. The airstrikes killed 20 YPG and YPJ fighters in Syria in addition to five Peshmerga soldiers in Iraq.
Attacks.
The attacks were authorized by the General Staff of the Republic of Turkey, who stated that the bombings targeted the Kurdistan Workers' Party (PKK) and were attempts to prevent the PKK from "sending terrorists, arms, ammunition and explosives" to Turkey. At around 2 a.m. EEST, Turkish planes conducted several airstrikes on YPG and YPJ positions atop Mount Qarachok, near the town of al-Malikiyah. The targets of the airstrikes were a YPG media center, a radio station, a telecommunications facility, and military bases. The airstrikes killed 12 YPJ and 8 YPG fighters and injured 18 more.
At around 2:30 a.m., Turkish airstrikes hit reported PKK positions atop Mount Sinjar. The airstrikes hit a Peshmerga communications tower and killed 5 Peshmerga soldiers and injured 9 more. Per the mayor of Sinjar city, no casualties were reported among the PKK.
Turkish response.
Recep Tayyip Erdoğan, the President of Turkey, stated that "We are obliged to take measures. We must take steps" after the airstrikes. Turkey stated to have contacted the United States, Russia, and Masoud Barzani, President of Iraqi Kurdistan, prior to the attacks. In response to the airstrike on a Peshmerga position which killed 5 of their soldiers, Erdoğan stated that it was "absolutely not an operation against [them]."
Aftermath.
On 26 April, the Turkish Army targeted YPG positions with artillery near the border town of al-Darbasiyah in northeastern Hasaka. Heavy clashes then erupted between the YPG and the Turkish Army on the border, resulting in multiple casualties. Meanwhile, clashes also broke out between the YPG and the Turkish Army on the western border near Afrin. Border clashes continued for the next two days, with border outposts being targeted from both sides which resulted in dozens of casualties.
On 28 April, Turkish forces removed a part of the Turkey–Syria barrier north of Amuda and targeted villages north of the city with artillery. On the same day, US troops, including 8 commanders, visited Derbassiye and other areas where the fighting took place. On 29 April, more US troops in armoured personnel carriers arrived on the Syrian side of the border.
References.
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