What happened to flavius and marullus when they removed the trophies from caesar's statues?

Shakespeare left it unclear, probably on purpose. They, themselves loyal to Pompei, are simply witnesses of the public's change of loyalty. They are also there to notice the crowd's frail affections. There is only one more mentioning of the two of them, later on in Act I, Scene 2, when Casca informs Cassius and Brutus that they have been "put to silence". It probably means they were killed or arrested.