Britain’s police watchdog is to hold an investigation after officers were filmed firing a stun-gun at their own local black race relations adviser who they apparently mistook for a wanted suspect, the force involved said on Friday.

Judah Adunbi, 63, who is a founder member of an Independent Advisory Group (IAG) which works with Avon and Somerset Police in western England to improve relations with the local black community, was shot with the high-voltage Taser gun last Saturday outside his home in Bristol.

A neighbour’s video of the incident posted on newspaper websites showed two officers speaking to Adunbi, saying they believed he was someone who is wanted. He refused to give his name saying “I’ve done no wrong” and later, after a brief scuffle, one officer shot him with a stun gun.