Activist: Al-Qaida group in Syria kills 20 rebels

In this Monday, Jan. 6, 2014 citizen journalism image provided by Aleppo Media Center, AMC, which has been authenticated based on its contents and other AP reporting, Syrians hold copies of the Quran, the Muslim holy book, during a demonstration to stop fighting between the Islamic State of Iraq and Syria (ISIS) and rebels, in Aleppo, Syria. (AP Photo/Aleppo Media Center AMC).

BEIRUT (AP) — Activists say a suicide car bombing by an al-Qaida-linked group has killed at least 20 rebels amid clashes in opposition-held areas in Syria.

Rami Abdurrahman of the British-based Syrian Observatory for Human Rights said on Wednesday that the bombing took place the previous day near the northern city of Darkoush.

Abdurrahman says the attack was carried out by the al-Qaida fighters from the Islamic State in Iraq and the Levant, who have been battling rebels from an array of Syrian rebel brigades, once their allies, since Friday.

The Local Coordination Committees also confirmed the bombing.

The rebel-on-rebel clashes across northern Syria are the deadliest infighting since the uprising against Syrian President Bashar Assad began in 2011.

Abdurrahman says at least 300 people have been killed in the infighting.