"At some point last night, the victim stated that she had been feeling homicidal and suicidal, that she was armed with a firearm and had intended to take the lives of the children and her own life."
He says someone found a vehicle matching McCullum's this morning with people inside. Harrison says when officers arrived, they found all three shot dead inside the vehicle.
"We obviously witnessed something very, very tragic."
A firearm was found at the scene. Authorities are trying to learn more about McCullum's mental health history. Harrison says the investigation is in its initial stages but they are determined to find out what exactly happened.
"We just ask for some patience and ask for you to have your thoughts and prayers with the family."