A new offence to cover lone individuals planning non-terrorist mass killings should be considered in the wake of the Southport attacks, the UK's terror watchdog has said. However the independent reviewer of terrorism legislation, Jonathan Hall KC, says the definition of terrorism should not be expanded or changed.

The terrorism definition should not be changed in the wake of the Southport murders but a new offence to address the gap for lone individuals planning mass killings should be considered, the UK’s terror watchdog has said.

Jonathan Hall KC said it was "horrifying" officers couldn't intervene despite knowing Rudakubana planned mass killings.