Pretty much every Islamist rebel group in Syria, including al-Nusra Front, is now battling ISIL.

Via Al Arabiya:

Al-Qaeda group known as the Islamic State of Iraq and the Levant (ISIL) on Tuesday urged its fighters to “crush” other rebel groups in Syria, in an audio message from the group’s spokesman.

Abu Mohammad al-Adnani called on ISIL fighters in Syria to “crush them (the rebels) totally and kill the conspiracy at birth,” warning opposition fighters that “none of you will remain, and we will make of you an example to all those who think of following the same path,” AFP reported.

ISIL’s threat came hours after a rival al-Qaeda group said it has joined forces with other rebel groups in fighting ISIL.

Al-Nusra Front leader Abu Mohammad al-Golani said in an audio recording that “high-level” fighting erupted between his group and ISIL on Tuesday.

He blamed the fighting on what he said were “mistakes” made by ISIL, such as the arrest of a Nusra commander in Raqqa.

In his message, Golani urged all rebel groups to unite against President Bashar al-Assad regime.

“This unfortunate situation prompted us to make this initiative to save the ground from loss. This initiative calls for the formation of a legitimate committee from all recognized factions with an independent leadership,” he said.

Golani also noted that all infighting in the groups must end and an exchange of prisoners should take place, adding that rebels should focus their efforts on fighting Assad’s forces and not fighting each other.