Scotland Yard has stopped short of offering an apology to the families of 17 justice campaigns, who a secret police unit kept information on.
I regret enormously the distress that has been caused.
The investigation is set to go on for another year and will report on the culture of the unit where "some behaviour that was not appropriate".
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Around 31 people are still thought to be missing after the boat sank on a reservoir near the city of Medellin.
Bins were set on fire and objects were thrown at officers as protesters demanded justice for the death of Edir Frederico Da Costa.