Thousands of rockets have been fired from the Gaza Strip into Israel in a surprise attack by the Hamas militant group on Saturday morning.
Large plumes of black smoke could be seen rising from a number of Israeli towns.
Images on social media show cars on fire and some buildings damaged, and the Israeli ambulance service reported one person had been killed and at least 15 wounded.
Mobile phone footage also shows Hamas fighters attempting to reach Israel by sea using small boats, and in a highly unusual development, a number of Palestinian fighters appeared to have crossed the border using paragliders, reaching the town of Sderot where gun battles were heard.
Footage from security cameras shows them entering the town in pickup trucks and motorbikes.
Air raid sirens sounded across southern and central Israel, and there were explosions in the cities of Tel Aviv, Ashkelon, Yavne and Kfar Aviv.
Israel’s Magen David Adom rescue agency said a 70-year-old woman was critically injured when a rocket hit a building in southern Israel.
Elsewhere, a 20-year-old man was moderately injured by rocket shrapnel, it said.
In response, the Israeli military says it is striking targets in the Gaza Strip.
The Israeli military said “a number of terrorists have infiltrated into Israeli territory”, with residents along the border area ordered to remain indoors.
Defence minister Yoav Gallant is said to be heading to Tel Aviv for an urgent update and Prime Minister Benjamin Netanyahu has convened an emergency meeting of his security cabinet.
This content is provided by Twitter, which may be using cookies and other technologies.
To show you this content, we need your permission to use cookies.
You can use the buttons below to amend your preferences to enable Twitter cookies or to allow those cookies just once.
You can change your settings at any time via the Privacy Options.
Unfortunately we have been unable to verify if you have consented to Twitter cookies.
To view this content you can use the button below to allow Twitter cookies for this session only.
The IDF has warned that “the Hamas terror group will pay a very heavy price”.
Hamas said the operation had only just started and it is a response to Israeli violence against Palestinians in the West Bank, Gaza and around Al Aqsa mosque compound in Jerusalem.
The militant group has called on armed groups in Lebanon to join the fighting.
Mohammad Deif, a senior Hamas military commander, said on Hamas radio that 5,000 rockets had been launched.
“This is the day of the greatest battle to end the last occupation on earth,” he said.
This breaking news story is being updated and more details will be published shortly.
Please refresh the page for the fullest version.
You can receive Breaking News alerts on a smartphone or tablet via the Sky News App. You can also follow @SkyNews on X or subscribe to our YouTube channel to keep up with the latest news.
