Israel’s military on Monday published new images and voiced concern about a mother and her two boys — including a baby who is the youngest hostage held by Palestinian militants in Gaza.

Hamas announced in November that all three had been killed in an Israeli bombardment but the Israeli authorities have not confirmed the claim.

Army spokesman Daniel Hagari said they were “concerned for the welfare” of Shiri Bibas, who was seen on a street camera in the southern Gaza city of Khan Yunis surrounded by seven armed men.

Kfir Bibas is the youngest Israeli hostage and was “stolen from his crib” in the community of Nir Oz when he was barely nine months old while his brother, Ariel, was just four, Hagari told a televised briefing.

If still alive, Kfir Bibas would have turned one year old on January 18.

In a statement on Monday, other members of the Bibas family described the images as “unbearable and inhumane” and called the kidnapping of children “a crime against humanity and a war crime”.

“Ariel and Kfir are victims of monstrous evil. Our whole family has become hostages along with all the hostages,” they added.

Prime Minister Benjamin Netanyahu vowed that “these kidnappers of babies and mothers” will be brought to justice.