To keep a lid on a drama that is about to boil over between some of your acquaintances, you need to stop being a blabbermouth to your friends! Do your part to keep everyone calm by not adding fuel to the fire. It might be hard to keep a juicy bit of gossip to yourself, but why toss it out into the middle of things? It will only make things worse, and you'll only be implicated. You need to step back and let these people work out their differences between themselves.