A suicide car bomber left  at least  four people dead at a checkpoint in a Kurdish-controlled area of northeastern Syria on Tuesday.

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 A Kurdish official confirmed an attack targeting a checkpoint operated by the Asayish Kurdish internal security force, but had no further details.

The Asayish could not immediately be reached for comment.

Observatory Director Rami Abdulrahman said the attack took place near the village of Tel Tamr, some 30 km (19 miles) from the Syrian-Turkish border.

The area is dominated by the Kurdish YPG militia, the main partner for the U.S.-led coalition in its campaign against Islamic State in Syria. The YPG is spearheading an assault to capture the city of Raqqa from Islamic State.