We are at war," says Israel's PM Benjamin Netanyahu, after a surprise Palestinian attack saw hundreds of rockets hit Israel from Gaza.
Dozens of gunmen from the Islamist militant group Hamas appear to have infiltrated southern Israel.
Hundreds of people are being treated in Israeli hospitals, with at least 22 Israelis dead, according to emergency services.
A senior commander from Hamas claims thousands of rockets were launched from Gaza into Israel.
Mohammed Deif says the Palestinian militant group had "decided to say enough is enough".
The Israeli military says it has begun striking targets in the Gaza strip in response "to the barrages of rockets"
Israel's emergency services say at least 22 Israelis have been killed after an unprecedented surprise Palestinian attack.
