Turkish security forces found the dead bodies of three men in Hazreti Huseyin mosque in the Silopi district of southeastern Sirnak province.
The first investigation determined that they were killed nearly 5 days ago and it is thought that the PKK terror organisation is behind the incident.
Anti-terror operations against PKK continue in several eastern and southeastern provinces where security forces are attempting to fill in trenches and remove road barricades set by terrorists.
The civilians, who were targeted when they were trying to escape the region due to the ongoing clashes between the terrorists and the soldiers, were protected by security forces and accommodated in a closed area.
Many citizens left the Cizre and Silopi districts of the Sirnak province after curfews were declared by the authorities in order to ensure the security of citizens during clashes.
The PKK is recognised as a terrorist organisation by Turkey as well as NATO, the US and EU.
The militant group began renewed terror attacks in Turkey when its umbrella organisation the KCK unilaterally ended an over two-year-long ceasefire with the government on July 11.
Last month, the Turkish president said more than 3,100 PKK terrorists had been killed in Turkey and northern Iraq. Around 300 soldiers, police and civilians have lost their lives since the conflict reignited in late July.