The family of an Israeli man who went missing in 2014 after crossing into the Gaza Strip appealed Monday to the international community to help bring him home.

Avraham Mengistu, a 29-year-old Israeli of Ethiopian descent, was deeply depressed and suffering from mental problems when he wandered unarmed across the border to Gaza a year and a half ago, they said.

Israel's Defense Ministry has determined that Mengistu was held by Hamas after illegally crossing the border, but the terrorist group governing Gaza has provided no information about his whereabouts or condition.

"We are kept in the dark," the man's 30-year-old brother Gashao told AFP during a visit to Geneva, with a representative of Israel's mission to the United Nations serving as translator.