The mother of Shani Louk, an Israeli-German woman thought to have been

kidnapped by Hamas fighters at a music festival in Israel, says her daughter is dead.

Speaking to German media, Ricarda Louk said she had been told by the Israeli military

that a DNA sample taken from part of a skull bone proved to be Shani's.

Her body has not yet been found.

Shani's sister also confirmed the death on social media.

Adi Louk wrote on Instagram on Monday that Shani had been killed in the

"massacre at Re'im" - a reference to the attack staged by Hamas in southern Israel, near the Gaza Strip, on 7 October.

But it was not clear from the reports where or when the fragment of her skull had been found.

Israel's foreign ministry wrote on X, formerly Twitter, that it was "devastated" to have to share the news of her death.