The arrival of Shiite-dominated militias raised fears that Sunnis could be targeted.
Iraqi forces aided by U.S. airstrikes enter the town of Amerli, where residents had been trapped.
Video, posted to YouTube Thursday by the group’s network of online supporters, is similar to the one that grimly showed the execution of American journalist James Foley last week.
Old hostilities between Arabs and Kurds exacerbate fighting with the Islamic State.
Insurgents are seeking to take over Sangin district, where 50 U.S. Marines lost their lives.
Residents wonder if things have changed permanently in Qasaba, where Taliban attacks are new.
A report from Human Rights Watch says unarmed protesters were systematically targeted last August.
Two senior executives of the New York-based group had planned to present a damning report.
Although Lashkar Gah in southern Afghanistan has largely been shielded from the violence elsewhere in the Helmand province, it remains a city on edge.
A teenager detonated a bomb hidden in his turban, killing Hashmat Khalil Karzai, Afghan officials said.