Police have said they will not give up on finding those responsible for the death of Pc Keith Blakelock following the acquittal of Nicky Jacobs.
Describing his murder in 1985 as "barbaric", Assistant Metropolitan Police Commissioner Mark Rowley said:
Sadly, Keith's widow, family and friends still have not seen anyone brought to justice for his murder.
The dignity, extraordinary patience and courage they have shown in their nearly thirty year quest for justice is humbling.
We will not give up on bringing Keith's killers to justice. There are people who know exactly who took part in the attack on Keith and people who took part themselves. It is not too late for you to come forward.
More top news
A teenager has been airlifted to hospital after being stabbed outside a DLR station in south-east London.
By law, the Met Police has a duty to police public land outside grounds - that's costing them £9.3m a season.
John, who began running for Age UK back in the 1980s when he was aged 53, has raised an incredible amount since then - more than £40,000.