‘Wherever they found the szlachta, royal officials or Jews,’ says the nearly contemporary Eye-Witness Chronicle, ‘they killed them all, sparing neither women nor children. They pillaged the estates of the Jews and nobles, burned churches and killed their priests, leaving nothing whole. It was a rare individual in those days who had not soaked his hands in blood .
This passage implies that Jewish estate owners were targetted alongside Polish ones rather than targetting Jews in general.

