A suicide truck bombing at a police headquarters in Turkey's largely Kurdish southeast killed at least 11 and wounded dozens on Friday, just hours after Vice President Joe Biden visited the country.
Prime Minister Binali Yildirim blamed the Kurdistan Workers Party (PKK) for the attack in the Sirnak province that borders Syria and Iraq, though no group has claimed responsibility.
Eleven police officers were killed and at least 78 people, including three civilians, were wounded.
The attack comes two days after Turkey launched a new offensive against Islamic State and Kurdish fighters in Syria. On Wednesday, special forces, tanks and warplanes entered into Syria in support of Syrian rebels in and effort to drive ISIS away from the border.
The Turkish government says the Islamic State, the PKK and the Syrian Kurdish YPG militia have launched attacks against Turkey in the weeks following the failed military coup against the Turkish government.
Biden was the highest ranking U.S. official to visit Turkey since the failed July 15 coup, but his visit was widely seen as a failure. Not only was he greeted at the airport by lower ranking officials, but the Daily Sabah, a pro-Erdogan newspaper, declared that "Biden wasted a trip, Turkey wasted time."
As the Turkish government continues to purge thousands of soldiers and government officials from the government of President Recep Tayyip Erdogan, the relations between the two countries remain tense.
The Turkish government has blamed a self-exiled cleric living in Pennsylvania, Fethullah Gulen, for inciting the coup, and has demanded his extradition.