London (AP) — Armed British police carried out an early-morning raid on a residential address near London’s Olympic Park, using smoke grenades and a stun gun in what they said was a pre-planned anti-terror operation.

Six people were arrested there — and in a separate raid in a western part of the capital — but Scotland Yard said the operation was not linked to the upcoming games, due to kick off on 27 July.

Police didn’t identify the suspects, who range in age from 18 to 30. However Mizanur Rahman, who is involved with a Muslim activist group, said all those arrested were British Muslims.

He said the three men arrested in Stratford, the neighbourhood that contains Olympic Park, were brothers and claimed that one was a former police officer.

A police spokesperson who spoke on condition of anonymity in line with police policy declined to comment on the claim.

Resident John Smallshaw said one of the raids took place at a residence on Abbey Road, only about 1.6km from the Olympic Park.

He said he was woken up just after 04:00 by “five loud bangs in quick succession” and saw police raiding the house. He said he later witnessed “one young man taken on foot to a waiting ambulance”.

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