An adviser to the wife of Israeli Prime Minister Benjamin Netanyahu shocked many on Saturday after posting a violent rant on social media in which she fantasised about torturing to death residents of Gaza she said were involved in last weekend's killings in southern Israel.

Tzipi Navon, a close adviser to and office manager for Netanyahu's wife, Sara, posted incendiary remarks on Facebook saying it was not enough to "flatten Gaza."

"It won't calm the storm of emotions, it won't dull the intensity of the rage and pain that can't find an outlet for them," Navon wrote.

Instead, she said the culprits should be captured and tortured "one-by-one" by pulling out their nails and skinning them alive.

Further detailing the type of torture she saidthey should endure, Navon said that male genitals should be cut off, fried and fed to the captured.

"Save their tongues for last, so we can enjoy his screams, his ears so he can hear his own screams, and his eyes so he can see us smiling," she said.