Militants suspected to be Palestinians in the Gaza Strip launched dozens of rockets toward Israel early Saturday morning, setting off air raid sirens across the country.
Africa Today News, New York reports that the rocket fire was fired from various sites in Gaza beginning at 6:00 am (0330 GMT).
For more than an hour, the Israeli army sent siren warnings over the southern and central regions of the nation, advising the populace to hunker down near bomb shelters.
The military also said “a number of terrorists have infiltrated into Israeli territory from the Gaza Strip,” without providing further information.
A 70-year-old woman was in critical condition and another person was trapped after a rocket hit a building in central Israel, the Magen David Adom emergency services said.
In a separate incident, medics said a 20-year-old man was hurt moderately from shrapnel.
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The office of Israeli Prime Minister Benjamin Netanyahu said the premier will shortly convene security chiefs over the violence.
There was no immediate claim of responsibility for the rocket fire.
Israel has imposed a crippling blockade on Gaza since 2007 after the Hamas militant group 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.
Protesters had resorted to burning tyres and throwing rocks and petrol bombs at Israeli troops, who have responded with tear gas and live bullets.
Critics had slammed the border closure as collective punishment against thousands of Palestinian workers, who have far greater earning potential in Israel than Gaza, where unemployment is rife.
Resuming their passage on September 28 had raised hopes of calming the situation in Gaza, home to 2.3 million people.