U.S. Secretary of State Antony Blinken said the Biden administration is trying to confirm reports that Americans are among those killed or taken captive.

As of Sunday afternoon, at least 700 people had been killed in Israel by Hamas and another 2,100 have been injured, the Israeli Health Ministry said. Israeli rescue service Zaka said at least 260 bodies were removed from the venue of the music festival that Damti's daughter attending in southern Israel when it came under a Hamas attack.

The Palestinian Health Ministry said 370 are dead and 2,200 others are injured in Gaza in retaliatory strikes by Israeli jet fighters and soldiers.

Israeli Prime Minister has declared \"Israel is at war.\"

\"PHOTO:
Video Obtained by Reuters/via Reuters
PHOTO: Yoni Asher told ABC News his wife is seen in this screengrab from a social media video published on Oct. 7, 2023 among a group of hostages Hamas militants, at an unknown location.
>

\"Kim didn’t realize seven or eight Toyota vans (were) full of terrorists,” Damti, crying, said of her daughter. \"They just shot everywhere. They slaughtered them like ducks. This behavior is barbaric. I didn’t bring my children up to hate anybody. I’m asking the world to condemn this.\"

Damti said the family hasn’t slept since the onset of the attack as they wait by the phone for word on her daughter's fate.

She said her daughter's father and brother have been traveling from hospital to hospital with a hairbrush containing Kim's hair, hoping for a DNA match and some answers.

Damti showed ABC News a photo of her missing daughter, pointing out her unique curly blond hair.

\"I know my daughter, she’s a gentle loving person, who wants to make the world a better place. I don’t know if we’ll get her back,\" Damti said.

The thought of never seeing her daughter again prompted more tears and fears that the worst had befallen her girl.

\"Maybe she’s been taken as a hostage in Gaza. I don’t want to think about that. Maybe she’s hiding somewhere. She’s clever. Or maybe -- I don’t know... I don’t even want to think.\" she said.

Damti's other daughter, Emily, said the family has also been combing through online videos of kidnappings and killings they said were carried out by Hamas militants, looking for any sign of her sister. But Emily said their search has yet to produce \"nothing.\".

“You can’t sleep. All I can think about is where she is,\" Damti said. \"If she’s suffering, if she’s still alive. I just want her back. I have three daughters. I can’t imagine my life without Kim.\"

ABC News' Bill Hutchinson contributed to this report.

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