At least 14 civilians were killed and 50 more injured in a bomb blast in northern Syria on Tuesday, local security sources said.

Attackers detonated an explosives-laden truck in al-Bab district of Syria’s Aleppo province, causing multiple casualties, the sources said.

Investigators are considering the possibility that the YPG/PKK terror group might be behind the attack in the city located near Turkey’s southern border.

This is the second bomb attack in the district within days, as two civilians were killed and seven injured in an explosion at a checkpoint on Sunday.

Turkish troops and the Syrian National Army liberated al-Bab from the Daesh/ISIS terror group in February 2017 as part of Turkey's Operation Euphrates Shield.

The seven-month operation was launched in August 2016 to eliminate terrorists hiding out in areas along the Turkish border.

In its more than 30-year terror campaign against Turkey, the PKK – listed as a terrorist organization by Turkey, the US, and the EU – has been responsible for the deaths of nearly 40,000 people, including women, children, and infants. The YPG is the PKK’s Syrian offshoot.