Families have spoken of the sheer panic of learning their loved ones may have been taken hostage by Hamas, after the militant group attacked Israel.
The Israeli military suggests dozens of people, including foreign nationals, have been taken as captives into Gaza. Here are some of their stories.
'I'm trying to stay calm'
The first inkling Yoni Asher had that his family were inside Gaza was by tracking his wife's mobile phone.
His wife Doron and their two children Raz, 5, and Aviv, 3, were staying with relatives close to the border with Gaza when the militants struck.
Yoni told the OceanNewsUK: "Saturday, around 10:30 in the morning, was the last call when I spoke with my wife. She told me that terrorists from Hamas had entered the house.
"They were in the safe, secure room then the call got disconnected. Later on, I managed to locate her mobile and it was inside Gaza".
Later that day, his worst fears were seemingly confirmed when he recognised his family being briefly shown in a video of people being loaded onto the back of a truck.
"In the video I recognised my wife and my two daughters, my two little babies," he said.
"I don't know in what terms or what conditions they are held but you know, the situation is getting much worse. "
For now, like other families, all Yoni can do is hope. "I'm trying to stay calm. I want to believe there is some contact between the diplomats negotiating or something but we don't know anything - that is the hardest thing".
'It sounds like a horror movie'
Noam Sagi said his heart sank when Palestinian media began broadcasting from in front of his 74-year-old mother's home, around 400m from the border with Gaza.
On Saturday afternoon, the Israeli Army entered grandmother-of-six Ada Sagi's property and found blood stains - but no sign of the elderly woman, he explained.
Speaking to OceanNewsUK, Mr Sagi - who lives in London - said his assumption was that his mother, who teaches Arabic, was among those kidnapped.
"We are talking about someone, 74 years old, who went into a safe room and [now] she is not there", he said.
"She is not on the dead list, she is not on the injured list, and it's a small community… 350 people max and they know each other, so they have gone through the process of identifying everyone."
The community are reporting that the elderly and the young have been abducted, according to Mr Sagi, who said there was not any formal or official confirmation of his mother's whereabouts. He pointed out that she could not run far following a recent hip replacement.
"It's somehow completely surreal, sounds like a horror movie, it's hard to compute", Mr Sagi continued.
"Just imagine a lovely, rural village here in the UK and people just going through their lives… and then you are just being snatched out of your house.
"It feels unreal… it feels inhumane… it is very upsetting to think that this is even possible. Even in war there are rules, and we are talking about men in their 20s and 30s that come into an old woman's house and snatch her and her neighbours."
He added that he was scared for his mother, who needs medication.
His wife Michal, who also spoke to the OceanNewsUK, said Ada had allergies.
"Without her medicines, we don't know how long she will keep on," she said. "I'm trying not to get into the negative scenarios, they're difficult to imagine."
Mr Sagi, who believes he will see his mother again, said he had been expecting her in London next week for her 75th birthday.
He described her as a very strong, inspiring and phenomenal woman, adding that he trusted her to "deal with the situation".
