DAMASCUS, April 9 (Xinhua) -- Two bombings rocked Syria's northern city of Raqqa on Tuesday, killing 15 people, a war monitor reported.
The explosions took place near a military post of the Kurdish-led Syrian Democratic Forces (SDF) in the city, said the Syrian Observatory for Human Rights.
The Britain-based watchdog group said four of the dead were fighters of the SDF.
It said the death toll could likely rise due to the number of critically wounded people.
It is not the first explosion that rocked Raqqa as sleeper cells of the Islamic State (IS) group had previously carried out similar bombings to take revenge on the SDF, after the city, the former de facto IS capital, was liberated from the IS rule in 2017.