Syria’s Islamic Front, the country’s biggest rebel alliance, issued Sunday a strong warning to jihadists, three days after a new front made up of local insurgents emerged against them.

“We fight against whoever attacks us and whoever pushes us to battle, whether they are Syrian or foreign,” said the Front, an alliance that groups tens of thousands of rebels seeking to topple President Bashar al-Assad.

Since Friday, along with the Syrian Revolutionaries Front and the nascent Army of Mujahedeen, the Front has been engaged in fierce fighting with the jihadist Islamic State of Iraq and the Levant (ISIL).