Five people have been arrested in connection with the death of a man on an Essex Farm 10 years ago.
Lee Balkwell's body was found trapped under a cement mixer at Baldwin's Farm in South Ockendon.
In January this year, an independent report found serious flaws in the original police investigation.
The 2 women and 3 men were arrested today on suspicion of perverting the course of justice and perjury.
One of the men was also arrested on suspicion of gross negligence manslaughter.