About 3,300 people have been killed in fighting between rebel factions trying to overthrow Syrian President Bashar al-Assad since the start of the year, the Syrian Observatory for Human Rights said on Wednesday.

The small but powerful al Qaeda-splinter group, the Islamic State in Iraq and the Levant (ISIL) has been caught up in clashes with other insurgents in Syria, including al Qaeda’s official Syria branch, the Nusra Front.

The fighting started over power struggles and territorial disputes and has since spread throughout rebel-held territory in Syria. […]