Premise: Family members and friends told Fox News that the couple had been fighting over several things, including Luong's girlfriend, on Sunday evening and Monday morning. Luong later drove off with his four children, whom he reported missing to the police and claimed he had left them with his girlfriend who lives in a hotel. Police however became suspicious due to "holes in his story" and he later changed his story. The Associated Press say that the authorities believe that Dauphin Island Bridge is where Luong threw the four children, of which he was the biological father of three, into the water.
Hypothesis: Police were suspicious of Luong's story.