Updated

The U.N. human rights office says it's "deeply disturbed" by the "lenient" 18-month prison sentence handed down by a Tel Aviv military court against an Israeli soldier who killed a badly wounded Palestinian assailant as he lay on the ground.

Spokeswoman Ravina Shamdasani of the rights office decried a "chronic culture of impunity" in Israel when it comes to soldiers involved in the conflict with Palestinians.

Sgt. Elor Azaria was sentenced Tuesday for manslaughter in the March shooting death in the West Bank city of Hebron of Adbelfattah al-Sharif, who had been injured after stabbing a soldier.

Shamdasani said over 200 Palestinians have been killed by Israeli security forces in West Bank violence since September 2015, and Azaria was the only soldier brought to trial for such a killing.