The parents of an Israeli man believed to be held by Hamas in Gaza since 2014 travelled to Geneva this week to demand international action to help bring him home. Avera Mengistu, a 33-year-old Israeli of Ethiopian descent, is depressed and suffering from mental problems since the death of his older brother when he crossed into Gaza five years ago. Israel’s defence ministry determined he was being held by Hamas, but the Islamist movement governing Gaza has to date provided no information about his whereabouts or condition.