LONDON (AP) —A British system under which suspected terrorists not charged with any crime were forced to live under partial house arrest was among the most repressive tools used in the West, the country’s anti-terrorism watchdog said Monday.

David Anderson, a lawyer responsible for reviewing Britain’s legal efforts to combat terrorism on behalf of the government, disclosed in an annual report that a total of 52 people had been held under the control order between 2005—when the measures were introduced—and the end of 2011, when the system was replaced.

The system allowed authorities to impose a curfew of up to 16 hours per day, required a suspect to wear an electronic anklet, restricted their contact with others and could ban an individual from using the Internet or traveling overseas.

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