The mother of Shani Louk, a 22-year-old German national believed to have been kidnapped by Hamas fighters during the militant group's surprise attack on Israel on Saturday, said on Tuesday that her daughter is alive.

Louk, a tattoo artist, was attending the Tribe of Nova music festival in the plains of the Negev Desert near Urim, close to the Gaza Strip, on Saturday when Hamas fighters stormed the event. She's believed to have been seized by the militants and paraded through the streets in the back of a pick-up.

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On Tuesday, Louk's family announced they had proof that Louk—who grew up in Israel—was alive. German news website Blick reported that her mother said she was in a hospital in Gaza with serious head injuries.

"We now have more information that Shani is alive," her mother told television channel NTV, adding she received the information from unnamed Palestinian sources.

The mother added that Louk is seriously injured, and asked the German government for help and quick action.