The jihadist Islamic State of Iraq and al Sham has signed a truce deal in Syria with an Islamist rebel brigade involved in a widespread armed backlash against it.

The deal signed Tuesday between ISIS and Suqour al-Sham was posted online on Wednesday, and also reported by the Syrian Observatory for Human Rights NGO.

It calls for “an immediate halt to fighting between the sides and no assault by either side on the other in any way.”