Law enforcement sources tell TMZ … the caller claimed a mother and father were in a fight and the father went to another room in the house to get a gun. At that point the caller hung up, never mentioning it was Chris Brown’s house.
When cops arrived there was no evidence of a gunman or for that matter any dispute.
Chris was NOT home at the time.
LAPD law enforcement sources tell us … they are determined to catch the culprits … and STAT.