Al-Qaeda killing al-Qaeda, doesn’t get any better than that.

BEIRUT (AFP) — Members of two Al-Qaeda-affiliated rebel groups have clashed in Syria’s northeastern Hasakeh province, with one group seizing the local headquarters of the other, a Syrian NGO said on Sunday.

Fighters from the Islamic State of Iraq and the Levant (ISIL), an Iraqi Al-Qaeda branch that has expanded into Syria, attacked the headquarters of Al-Nusra Front in Shadadi, the Syrian Observatory for Human Rights said.

“ISIS fighters on Saturday attacked the Nusra Front regional headquarters in Shadadi, taking control of the headquarters and seizing weapons and oil production equipment,” the group said.

The two sides clashed, but the Observatory said Al-Nusra had relatively few fighters at the headquarters because they are currently battling Kurdish forces elsewhere in the region.

Al-Nusra Front has pledged allegiance to Al-Qaeda chief Ayman Al-Zawahiri, but its leader rejected an ISIS merger bid.