WARNING: This report contains details of death some people may find distressing. A relative of a teenage Iranian protester has told Sky News his cousin was beaten to death with a gun butt by Iranian security forces after being shot in the heart. The 17-year-old had joined protesters in the city of Kermanshah when he was shot and then attacked. At least 500 people have been killed by Iran's security forces in a week of protests. Live updates: https://news.sky.com/story/iran-latest-protests-live-