Members of the hit squad are alleged to have played different roles as shooters, drivers and spotters on the day Nijjar was killed at the Guru Nanak Sikh Gurdwara in Surrey, according to the sources.

Months-long investigation into politically charged killing also probes links to other cases: sources

The diplomatic row escalated after Prime Minister Justin Trudeau alleged India’s government may have been involved.
Delhi strongly denied the allegation.Mr Nijjar was a Sikh separatist leader who publicly campaigned for Khalistan – the creation of an independent Sikh homeland in the Punjab region of India.
In the 1970s, Sikhs launched a separatist insurgency in India which saw thousands killed before it was quelled the following decade. Since then, the movement has been mostly limited to countries with large Sikh populations.