Palestinian militants Hamas fired thousands of rockets from the Gaza Strip into Israel on Saturday morning.
The Israeli Defense Force says it is declaring “a state of readiness for war” in response to the surprise attack. The defence minister has approved a call-up for military reservists.
The Israeli military launched retaliatory airstrikes in the Gaza Strip and warned of further escalation.
Prime Minister Benjamin Netanyahu called an emergency meeting of security officials as warning sirens sounded across southern and central Israel.
Hamas gunmen are believed to have infiltrated Israel in the most serious escalation of the conflict since the two sides fought a ten-day war in 2021.
Hamas military commander Mohammad Deif announced the start of the operation in a broadcast on Hamas media, calling on Palestinians everywhere to fight.
“This is the day of the greatest battle to end the last occupation on earth,” he said, adding that 5,000 rockets had been launched.
One Israeli woman was killed, according to emergency services, as ambulance crews were deployed in areas around the Gaza Strip.
The Israeli military said its forces were operating inside Gaza but gave no further details.
“A number of terrorists have infiltrated into Israeli territory from the Gaza Strip,” the military said in a statement, adding that residents in the area surrounding the Gaza Strip had been told to stay in their homes.
Israeli media reported that gunmen had opened fire on passers-by in the town of Sderot, in southern Israel, and footage circulating on social media appeared to show clashes in city streets as well as gunmen in jeeps roaming the countryside.
“We were told there are terrorists inside the kibbutz, we can hear gunfire,” a young woman named Dvir, from Beeri Kibbutz, told Israeli Army Radio from her bomb shelter.
Palestinian media also reported that a number of Israelis had been taken captive by fighters and Hamas media circulated video footage apparently showing a destroyed Israeli tank.
The Israeli military was aware of reports of captives, a security source said, but provided no further details.
Netanyahu’s office said he would meet top security officials in the coming hours and Defence Minister Yoav Gallant authorised the call-up of reservists.
In Gaza the roar of rocket launches could be heard and residents reported armed clashes along the separation fence with Israel, near the southern town of Khan Younis, and said they had seen significant movement of armed fighters.
Israel’s ambulance service said teams had been dispatched to areas in southern Israel near Gaza and residents were warned to stay inside.
A group representing military reservists who had planned to refuse to attend training over their objections to the government’s plans to overhaul the judiciary called on reservists to report for duty.
The Palestinian Islamic Jihad group said its fighters were joining Hamas in the attack.
“We are part of this battle, our fighters are side-by-side with their brothers in the Qassam Brigades until victory is achieved,” said Islamic Jihad armed wing spokesman Abu Hamza on a post on Telegram.
Palestinians in Gaza expressed disbelief at the infiltration into Israel. “It is like a dream. I still can’t believe it, fighters inside our occupied land?” said one Gaza shopkeeper.
It comes a day after Israel marked the 50th anniversary of the 1973 war that brought the country to the verge of catastrophic defeat in a surprise attack by Syria and Egypt.
