Wow, I can’t believe Obama’s airstrikes are doing absolutely nothing.* More on this story.

BAGHDAD (Reuters) – Islamic State has executed 85 more members of the Albu Nimr tribe in Iraq, a tribal leader and security official said on Saturday, part of a mass killing campaign launched last week to break local resistance to the group’s territorial advances.

Tribal chief Sheikh Naeem al-Ga’oud told Reuters Islamic State had killed 50 members of Albu Nimr who were fleeing the group in Anbar province on Friday. A further 35 bodies were found in a mass grave, a security official said.

Islamic State has executed a total of more than 300 tribe members in the past few days, Ga’oud and the official said.

The sustained bloodshed appears to demonstrate the group’s resilience to the U.S. air strikes that have been targeting its fighters in Iraq and Syria.

Ga’oud said he had repeatedly asked the Shi’ite-led central government in Baghdad for arms but that his pleas were ignored.

Albu Nimr had held out for weeks under siege by Islamic State, but finally ran low on ammunition, fuel and food.

*There’s no such thing as too much sarcasm.