Anchored by Jake Tapper, The Lead airs at 4 p.m. ET on CNN.
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Jerusalem (CNN) - Jerusalem ramped up security after two Palestinian cousins wielding a gun and butcher knives attacked a synagogue during morning prayers, killing four worshipers and a police officer and wounding several others.
Israeli Prime Minister Benjamin Netanyahu vowed a strong reaction to Tuesday's killings. He characterized the attack, which drew condemnation from around the world, as the result of a "blood libel" fanned by Palestinian leaders.