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The sign commemorates British student Hannah Baldon, who was stabbed to death in a terrorist attack on a Jerusalem light rail. The attacker, an Arab resident of East Jerusalem who suffered from mental disorders, also wounded two other people.
Translation of the text on the sign: In memory of Hannah Bladon May God avenge her blood
who was murdered on the light rail in a stabbing attack on 18th of Nissan 5777 (14.4.17)