ASHKELON, Israel — In the grainy security camera footage, Avera Mengistu walks along the beach on the Israeli side of the border, marked by a wall and netting. Then, suddenly, he appears on the other side, in Gaza.
“You don’t see how he got there,” said his mother, Agernsh, describing the video from the security services that she and other relatives saw, as tears rolled down her face. Filmed from a particular angle and possibly edited, the family said, the video left them with as many questions as answers.
Almost a year after the disappearance of Mr. Mengistu, a 29-year-old Israeli Jew of Ethiopian descent, his family remains mostly in the dark about his whereabouts or condition. The Israeli authorities say they believe he is alive and being held hostage by Hamas, the Islamic militant group that controls the Palestinian enclave.
Shifting gears, the family was planning its first public protest to be held Monday outside an Israeli prison where relatives of Palestinian prisoners were expected to visit. The demonstration would be one of a series of protest actions focusing on the humanitarian aspect of the case, according to representatives of the family.
Until now the family had called on the public to act with restraint and to give the Israeli authorities more time to work behind the scenes, fearing that a noisy public campaign may only raise the value of Mr. Mengistu in Hamas’s eyes, and increase the price for his return. Israel said last month that Mr. Mengistu had crossed the border into Gaza independently, lifting an official gag order on the case and touching off a flurry of media attention.
But a haze of official secrecy continues to hover over the episode. The Mengistu family says it has received no new information on the case for the past month. Hamas has spread ambiguous hints and contradictory messages about Mr. Mengistu, demanding a price for any firm information and intentionally adding to the uncertainty.