The BBC's Paul Danahar: "The suspicion is that they have come across the Egyptian border and carried out these attacks"
At least five people have been killed in a series of attacks on vehicles in southern Israel, Israeli medics say.
The attacks began when gunmen fired at an Israeli bus that was travelling near the Egyptian border.
Reports said two other vehicles were hit - one by a rocket and one by an explosive device - and that there was a continuing firefight.
It is the first major attack on Israel's border with Egypt for several years, the BBC's Paul Danahar reports.
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