Rikki Hall, 33, was on duty in Swansea when he allegedly attacked the woman, the police watchdog said.
Mark Fraser, 40, from Aberdare, threw a bag of bottles at a police car responding to an emergency.
Some barricade the entrances to their fields with concrete blocks and fallen trees.
Tommy Gillespie told the officers he would "chop their heads off" if they came closer.
A member of the public performed CPR on the boy until an ambulance arrived.
A road in Swansea has been closed after clouds of smoke were seen billowing into the sky.
Police are reviewing the evidence 40 years after the murder of Cardiff newsagent Philip Saunders.
The deaths of teenagers Kyrees Sullivan and Harvey Evans sparked a night of violence in Cardiff in 2023.
The deaths of teenagers Kyrees Sullivan and Harvey Evans sparked hours of violence and vandalism.
