The 12 tribes were cast out for false idols, sexual immorality. As far as in the Bible. Assyria went into Judah and conquered the land of Judah which in return ran the rest of the tribes out. Thos happened because all tribes but levies were going against God heavily

Do you mean exiled to Babylon?

By time of the Babylonian exile, there were fewer than the original 12 tribes as the Northern kingdom (Israel) had been destroyed leaving the Southern kingdom (Judea). Research Moloch and the term "passing their children through fire" which means putting their child into the heated metal statue of

Moloch is a name or a term which appears in the Hebrew Bible several times, primarily in the book of Leviticus. In the Hebrew Bible, Moloch is presented as a foreign deity who was at times illegitimately given a place in Israel’s worship as a result of the syncretistic policies of certain apostate kings.