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The Calamity which befell the Jews in Jerusalem on the Day of the Passover.
Church History (Historia Ecclesiastica) · Eusebius of Caesarea
1. While Claudius was still emperor, it happened that so great a tumult and disturbance took place in Jerusalem at the feast of the Passover, that thirty thousand of those Jews alone who were forcibly crowded together at the gate of the temple perished, being trampled under foot by one another. Thus the festival became a season of mourning for all the nation, and there was weeping in every house. These things are related literally by Josephus.
EusHE 4.20.1