RAMALLAH, West Bank (AP) — Preliminary autopsy findings show that a Palestinian teen killed during a lull in a West Bank confrontation between stone throwers and Israeli troops was shot dead by live ammunition, two human rights groups said Thursday.

The Israeli military has denied use of live ammunition in the May 15 incident, insisting troops only used rubber-coated steel pellets, a standard means of crowd control. Troops are only permitted to use live ammunition in life-threatening situations.