Barrages of rockets were fired from the blockaded Gaza Strip on Saturday, killing at least one person in Israel, an AFP journalist and medics said.
The Israeli army warned of sirens across the country’s south and central areas, urging the public to stay near bomb shelters.
The armed wing of Palestinian group Hamas said it was behind the fire, claiming its militants had launched more than 5,000 rockets.
“We decided to put an end to all the crimes of the occupation (Israel), their time for rampaging without being held accountable is over,” the group said.
“We announce Operation Al-Aqsa Flood and we fired, in the first strike of 20 minutes, more than 5,000 rockets.”
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Israel has imposed a crippling blockade on Gaza since 2007 after Hamas took power.
Palestinian militants and Israel have fought several devastating wars since.
The latest fire follows a period of heightened tensions in September, when Israel closed the border to Gazan workers for two weeks.
The shutdown of the crossing came as Palestinian protest rocked the heavily militarised border.