Many are asking why more wasn't done to prevent the shootings after a spate of antisemitism-related offences.
The 78-year-old UK citizen was convicted of lobbying foreign governments to impose sanctions on HK and China.
Authorities say two rabbis, a Holocaust survivor and a 10-year-old girl were among the victims.
He directed classic films including The Princess Bride, This is Spinal Tap and When Harry Met Sally.
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