An explosion at a district governor's house in Mardin province, southeastern Turkey, wounded three people Thursday, including the local governor.

The blast happened in the town of Derik, situated between Diyarbakir and the Syrian border.

Turkish state media said the cause was a rocket attack by rebels from the Kurdistan Worker's Party, or PKK, and that security forces were searching for those responsible.

The PKK has carried out frequent attacks in southeastern Turkey where it has waged a three-decade insurgency.  

There was a cease-fire between the rebels and the government that lasted for three years but it broke down more than a year ago as President Recep Tayyip Erdogan launched a campaign to eradicate the PKK.  Turkey, the United States and the European Union all consider the group a terrorist organization.

More than 40,000 people have died in the conflict since 1984.