An argument between the fathers of two six-year-olds in Vallejo led to one of the dads allegedly killing the other. KRON 4 has the story, which comes via sources at Vallejo Unified School District who say that the killing, which happened around 10 a.m. Thursday morning, stemmed from a fight the previous day in which two first graders at Loma Vista Elementary were sent to the principal's office for insulting each other.

The father of one of the children then apparently went to the home of the other child and shot the other father. There were "reports of a large fight" at the time of the shooting, per KRON 4.

The shooting happened on Kemper Street in Vallejo, and neither the victim's name nor the suspect's name has been made public. KRON 4 also was not certain whether the suspect was in custody.

More on this story as it develops.