I just had a match where multiple people exploded out of the blue.
When it happened to me I was flying out of North Boscali and I heard the sound of someone shooting at me from behind (with guns) and was shot down but there was no one there and the chat didn't credit the kill to anyone.
I don't know the specifics of how this is done but adding some sort of anti-cheat will be important in the long term, many great games have died because of rampant cheating.