Excerpts from Books and Wikipedia
"All this time the crusaders had been fighting the Seljuk Turks, but now they were making their way into the territory of the Fatimid caliphs of Cairo, who had retaken Jerusalem from the Seljuks in August 1098. . . . Over the course of the next two days, the crusaders indiscriminately murdered almost every inhabitant, be they Muslim or Jew, and even some Eastern Christians. Even those who had taken shelter in the Al Aqsa Mosque were ruthlessly slaughtered." [Furtado: 1001 Days]