Islamic State wrested a Sunni Muslim village in western Iraq on Thursday from tribal defenders who put up weeks of fierce resistance, and the insurgents tightened a siege of the Yazidi minority on a mountain in the north.

The attacks showed Islamic State’s continued operating resilience despite air strikes by U.S.-led coalition forces aimed at defeating the ultra-radical Sunni jihadist group, which has captured large expanses of Iraq and neighboring Syria, beheaded prisoners and massacred people from other religious communities, and declared a medieval-style caliphate.

The Albu Nimr tribe had been fending off Islamic State (IS) since early October but finally lost the village of Zauiyat albu Nimr in the western province of Anbar overnight on Thursday. […]