By Hasan Namli and Omer Yasin Ergin
DIYARBAKIR, Turkey (AA) - Investigators have revealed details about Thursday's PKK terror attack in Turkey's southeastern province of Diyarbakir.
The attack on a vehicle in Kulp district took place at 6 p.m. local time (1500GMT) killing seven civilians and injuring 10 others.
Nine people are being treated at the hospital for injuries.
An improvised explosive device was used in the attack targeting villagers on their way to collect firewood.
A probe launched into the attack found out that a vehicle belonging to the Diyarbakir Municipality was at the scene of the crime shortly before the explosion. Arrest warrants were issued for four suspects.
The district head of the opposition Peoples' Democratic Party (HDP), long accused by the government of having links with the PKK, was arrested along with the civil works director at Kulp Municipality.
An operation against the terror group is ongoing in the region.
The explosion has left a 1.5-meter dent in the ground.
In its more than 30-year terror campaign against Turkey, the PKK -- listed as a terrorist organization by Turkey, the U.S. and the EU -- has been responsible for the deaths of some 40,000 people, including women, children and infants.
*Writing by Sena Guler