“Arab tribesmen clashed with U.S.-backed Kurdish fighters in several areas of eastern Syria on Tuesday, leaving at least 10 people dead and others wounded, opposition activists and pro-government media said. The clashes are among the worst in recent years in the region along the border with Iraq where hundreds of U.S. troops have been based since 2015 to help in the fight against the Islamic State group. The clashes first broke out Monday, a day after the U.S.-backed and Kurdish-led Syrian Democratic Forces detained the commander of a formerly allied group and several other members of his faction after they were invited to a meeting in the northeastern city of Hassakeh. Some Arab tribesmen in the eastern province of Deir el-Zour were angered by the detention of Ahmad Khbeil, better known as Abu Khawla. He heads the Deir el-Zour Military Council, which was allied with the SDF in its yearslong battle against the Islamic State group in Syria.”