Accordingly, they [Greeks and Syrians in Seleucia] fell upon them [the Jews], and slew about fifty thousand of them; nay, the Jews were all destroyed, excepting a few who escaped, either by the compassion which their friends or neighbors afforded them, in order to let them fly away. These retired to Ctesiphon, a Grecian city ...
It sounds like the Jewish population of the area around Babylon was driven out, and then mostly slaughtered.