The forces said security records and investigations showed that al-Shahin began working with Air Force Intelligence in 2015 under the command of Suheil al-Hassan before later helping establish armed groups.
They said al-Shahin was directly involved in attacks against civilians, including incidents in eastern Hama countryside and along the Athriya-Raqqa road in 2017.
The forces also said he led his groups in killings, arrests, torture and destruction in Palmyra and later in Deir ez-Zor Governorate until 2019.
The authorities said investigations with al-Shahin were ongoing to complete the necessary legal procedures before referring him to the competent judiciary.