I live about 10 minutes away from where it happened. The local community are in total shock, my heart goes out to that poor baby and his family.
Acoording to local gossip the father has a history of DV and is well known as a bit of a thug. Initial reports said there was a woman with him who filmed the incident and the assumption was that it was the mother, hence why she's had to release a statement saying that she wasn't there. As no-one else has been arrested I assume that wasn't the case.
It's just incomprehensible. The river's deep and fast flowing there, an adult would struggle to survive. He must have known what the outcome would be. I hope he rots, slowly and painfully.