Jagtar Singh Johal has been formally charged for the first time since his detention in 2017.
Mr Johal, who was arrested in November 2017 in the Punjab region, is accused of being part of a terror plot against right wing Hindu leaders.
Dan Dolan, director of advocacy, said: "Jagtar's detention has been recognised as arbitrary by both the British prime minister and a group of UN legal experts. Mr Dolan said the judge repeatedly asked prosecutors to produce corroborating evidence but they were unable to present any, despite the fact they have had more than four years to prepare a case."UN legal experts have made clear that Jagtar should be released immediately, so what is the government waiting for?"He said: "Even after they acknowledged he is arbitrarily detained, they continued to delay.
Almost five years on, Mr Johal has not stood trial in any of the cases against him and has insisted he has been "falsely implicated" in the killings.
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