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Six people were killed in a random shooting in the city's main square, and three bodies were later found at the home of the attacker.
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Saudi Arabia, which leads a coalition fighting the Houthis in Yemen, has not commented.
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The national mood is low, and faith in politics even lower - with voters deserting the major parties at the polls.
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Neither PM Benjamin Netanyahu's bloc nor that of his rival secured a majority in last week's election.
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Donald Trump has repeatedly raised the prospect of renewing strikes against Iran's nuclear facilities.