Fighters of the Syrian Democratic Forces, a U.S.-allied Kurdish-led rebel group, patrol through the Islamic State-held village of Baghouz in the eastern Syrian province of Deir Ezzor. SDF officials have said the extremists are clinging to an area less than a square kilometer in the village of Baghouz and preventing more than 1,000 civilians from leaving the area. (Aboud Hamam/DPA/Zuma Press/TNS)