Human Rights Watch and six individuals lodged a challenge with the European Court of Human Rights, demanding that the UK Investigatory Powers Tribunal confirm whether or not they were subject to surveillance by the UK Government Communications Headquarters (GCHQ). The challenge, filed on November 4, 2016, also seeks to know whether or not any such surveillance was unlawful and comes after claims filed with the UK tribunal in 2015.

In the earlier case, the tribunal dismissed the claims of thos...