add fuel to the fire
add fuel to the flames
fan the flames
pour gas on the fire
pour gasoline on the fire

Officials said an open door or window in the back allowed wind into the house, fanning the flames.

The vision only fanned the flames of her anger again.

Even the wind had seemed to shift, fanning the flames in every direction.

Such strong measures only fanned the flames of protest, however.

Israeli officials say Iran is fanning the flames of the conflict.

Canyon winds fanned the flames of an early morning fire.

"I would caution even you guys in the media to not keep fanning the flames," he said Thursday.

All we are doing is fanning the flames of enmity.

The night breeze strengthened, fanning the flames of the fire.

But by then the press was already all over the story, and the retraction only fanned the flames.