A Turkish civilian was killed and three police officers wounded when suspected militants with the outlawed Kurdistan Workers' Party (PKK) opened fire on a cafe in the southeastern city of Diyarbakir, security sources said.

The incident happened on Friday when a small group of police were in a cafe in the center of the city, the provincial capital of Diyarbakir Province.  

According to security sources, three police were wounded and a young male civilian, who was working as a waiter in the café, was also killed.

An operation to nab the militants involved in the incident is now underway in the area.

Also on Thursday, two policemen were injured when PKK terrorists opened fire on an armored police vehicle in the same province.

Security sources said the attack happened in front of the provincial headquarters of Prime Minister Ahmet Davutoglu's Justice and Development Party (AKP).

The terrorists ran away after the incident.

Over the last weeks, Diyarbakir has seen a spate of deadly attacks against the Turkish security forces.

This comes as The Turkish military has been conducting offensives against the alleged positions of Takfiri Daesh terrorists in northern Syria as well as those of the PKK in northern Iraq and southeastern Turkey.

The operations started in the wake of the deadly July 20 bomb attack in the southern Turkish town of Suruc, across the border from the northern Syrian town of Kobani, where over 30 people died. The Turkish government blamed Daesh for the bombing. 

On July 22, the PKK also claimed responsibility for the killing of two Turkish police officers, saying they were cooperating with Daesh.

A shaky ceasefire between Ankara and the PKK that had stood since 2013 was declared null and void by the militants following the Turkish airstrikes against the group.

The PKK has been fighting for an autonomous Kurdish region in southeastern Turkey since 1984. The conflict has left tens of thousands of people dead.