The arrest of Greta Thunberg under Britain's terrorism laws has ignited a fierce national row over how far the UK is now willing to go in policing protest, particularly when sweeping counter-terror powers are used against non-violent political expression.
The 22-year-old climate activist was detained during a pro-Palestinian demonstration in central London before being released on bail, with the case now poised to become a flashpoint in the escalating clash between national security enforcement and free speech.
