IS militants leave behind dozens of dead civilians, a trashed refinery complex, and a town choked by oil fires.

Over two days of grinding battles, thousands of soldiers liberate a swath of Hamdaniya, highlighting the difficulty of making even incremental gains on the road to Mosul.

Scorched-earth tactics cause deadly environmental damage, highlight IS group's battlefield losses and failure to sustain oil-fueled state.

Militants invade a gas compressor station and major oil field in Kirkuk province, killing police and oil workers and blowing up a storage tank.

After the loss of Q-West to Iraqi forces on Saturday, signs emerge that the IS group is crumbling south of Mosul, just as more American troops are announced for the fight.

The Islamic State group's fledgling oil sector in Iraq has been severed by the Iraqi military victory at the Qayarah air base south of Mosul.

Indigenous IS fighters in northern Diyala province are using insurgent tactics to threaten areas that have ostensibly been reclaimed by government-backed forces.

Prices of basic fuels have risen by up to 80 percent and quality has plummeted after a June 6 airstrike crippled IS’s import network of road tankers. US officials say the "best" third of the IS oil sector has now been destroyed.