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STORY: Hamas launched a surprise assault on Israel on Saturday (October 7) - its biggest in years.

Gunmen from the Palestinian Islamist movement crossed from Gaza into Israeli towns in an unprecedented infiltration by land and air.

Hamas also fired a heavy barrage of rockets into Israel.

We are at war," said Israeli Prime Minister Benjamin Netanyahu, and "the enemy will pay an unprecedented price."

Israel's military said its forces were operating inside Gaza but gave no details.

Hamas military commander, Mohammad Deif said the group had fired 5,000 rockets.

"This is the day of the great revolution to end the last occupation on earth," he says.

This video obtained by Reuters shows Palestinians pulling what appears to be the body of an Israeli soldier from a tank on the Gaza border, as Palestinians cheer.

Another, released by the Hamas armed wing, is said to show fighters overrunning an Israeli military camp.

Warning sirens sounded across southern and central Israel.

This was the aftermath of the deadly attack in Rehovot.

Israeli media reported gunbattles between bands of Palestinian fighters and security forces.

In one of the most serious escalations in the Israeli-Palestinian conflict in years.

Hamas released other videos it said showed Palestinian gunmen inside Israeli homes and touring an Israeli town in jeeps.

The Israeli military said it had launched air strikes into Gaza, where witnesses reported hearing heavy explosions.

A Palestinian bulldozer broke through the border fence and people streamed out of Gaza to cries of "God is Great."

In Gaza, people rushed to buy supplies in anticipation of days of conflict ahead.

Some evacuated their homes and headed for shelters.