When the Palestinian militant group Hamas launched an attack on Israel over the weekend, Palestinians living in the besieged Gaza strip had mixed feelings.
Some celebrated, taking pride in what they perceived as a victory against Israel. Others, however, were afraid, dreading a deadly retaliation.
The militant group's unprecedented incursion prompted vows of retribution from Israeli Prime Minister Benjamin Netanyahu, who declared that his country was at war, pledging a "mighty vengeance for this black day".
READ MORE: Israel vows complete siege of Gaza as it strikes Palestinian territory after incursion by Hamas
By Monday, the retaliation was in full swing, as Defence Minister Yoav Gallant ordered a "complete siege" of Gaza.
"I have given an order – Gaza will be under complete siege. No electricity, no food, no fuel. Everything closed. We are fighting barbaric (terrorists) and will respond accordingly," he said on camera, adding that water to the enclave would also be cut off.
More than 700 people were killed in Israel by Hamas fighters who breached the border from Gaza, Israel Defence Forces (IDF) spokesperson Major Ben Wahlhaus told CNN on Sunday.
In response, IDF spokesperson Rear Admiral Daniel Hagari said Sunday that Israel had destroyed around 800 targets in Gaza, including what he described as launching pads used by Hamas.
At least 560 Palestinians have been killed and a further 2,900 injured, the Palestinian Ministry of Health in Gaza said Monday. The ministry said on Sunday that the dead included 78 children.
No strangers to war with Israel, many Gazans are sheltering in their homes, with the vast majority lacking access to bunkers. The territory is one of the most densely populated places on earth, where some 2 million people live in an area of 360 square kilometres.
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Those who venture out do so only to complete essential errands, or to look for their missing in the carnage of Israeli strikes. The streets are damaged and covered with rubble, and the air smells of dust and gunpowder.
Salim Hussein, 55, lost his home when his building was targeted in an Israeli airstrike. He lived on the first floor and told CNN that he and his family were given warnings by Israel just moments before the building was struck.
Hussein said he did not know why the tower was struck. He had moved in with his family just five months ago.
"We left (the tower) only with the clothes we had on," he told CNN, adding that he and his family now have nothing left and nowhere to go.
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Following Hamas' incursion, Palestinians were also barred from leaving Gaza through the Erez Crossing, which has become the site of a battle between Hamas and Israeli forces.
Since Sunday, power is only available for an average of four hours per day, down from the usual eight hours. Israel supplies the majority of Gaza's electricity. Internet connectivity has also been choppy.
Israeli opposition leader and former caretaker prime minister Yair Lapid told CNN on Monday that everything was on the table, including a ground incursion into Gaza, but that Israel must consider the fate of dozens of hostages that have been taken into the enclave.
It is unclear how many people have been kidnapped – Israeli authorities have said "dozens" are being held in Gaza, while Hamas claims to have more than 100.
READ MORE: What you need to know about the Hamas attack on Israel
Later on Monday, the Palestinian health ministry in Gaza said Israeli airstrikes targeted the al-Shati and Jabalia refugee camps, killing a "large number of people".
"The occupation committed a massacre against an entire neighborhood by targeting the al-Sousi Mosque in al-Shati refugee camp," Ashraf Al Qidra, a spokesman for the health ministry, said in a statement.
"A large number of martyrs and wounded have arrived at al-Shifa Medical Complex."
The health ministry added that bodies were still being recovered from under the rubble. It did not immediately release a death toll.
'Panic and fear'
The Gaza Strip has been almost completely cut off from the rest of the world for nearly 17 years.
Governed by Hamas since 2007, the enclave is under strict siege by Egypt and Israel, which also maintains an air and naval blockade. It has been described by Human Rights Watch as the "world's largest open-air prison".
Gazans have seen Israeli strikes ravage the strip on several occasions since Israeli forces withdrew from the territory in 2005. Fighting regularly takes place between Israel and Palestinian factions in Gaza, including Hamas and Islamic Jihad.
Over the weekend, Israel struck down at least 10 towers in Gaza that it said were used by Hamas, IDF spokesperson Hagari said on Sunday, adding that tens of thousands of Israeli soldiers are operating on the ground around the Gaza Strip.
The IDF on Sunday said it is now focusing on taking control of the Gaza Strip, and urged civilians there to leave residential areas near the border immediately for their safety as Israeli military operations continued to target Hamas.
But most Gazans have no way of fleeing the besieged enclave. All crossings out of the territory are shut, with the exception of the tightly controlled Rafah crossing with Egypt.
Hani el-Bawab, 75, said he and his family of four had been up all night, fearing airstrikes. The tower adjacent to his home was hit by Israel, collapsing onto his own house and rendering him and his family homeless.
"I don't know what to do," el-Bawab said. He now lives on the street, while his wife stays with an acquaintance.
Palestinians in Gaza, he said, are living in "panic and fear", preparing each moment for a bomb to crash into a building.
"I just want a house to live in with my kids. I just want shelter," he told CNN.
Nevertheless, he doesn't regret Hamas' attack on Israel.
"Every time, they (Israel) are the ones who attack us," he said.
"This time, the (fighters) are the ones who went in."