Some articles on hazarikas:

Suklamphaa - Reign - Illness of Ramdhwaj and The Issue of Succession
... king’s chamber all the Phukans and Hazarikas on the pretext of a serious turn to the monarch’s illness, and he killed one by one during the course of one single ... justified the massacre of the Phukans and Hazarikas by pointing out that they were all enemies of the king, and that he should not therefore feel aggrieved ...