The U.S.-backed Syrian Democratic Forces (SDF) began an assault against the final Islamic State enclave in eastern Syria on Saturday, aiming to wipe out the last vestige of the jihadist group’s “caliphate” in the SDF’s area of operations.

Foreign fighters reportedly executed after launching attack against Abu Bakr al-Baghdadiby Martin Chulov in Baghouz, eastern Syria.

U.S.-backed and Kurdish-led Syrian forces said Saturday they have launched a final push to defeat the Islamic State group in the last tiny pocket the extremists hold in eastern Syria.