Source:
The GuardianSenior police were told 48 hours after Ian Tomlinson's death that officers had witnessed a colleague push him to the ground at the G20 protests, but the information was withheld from the police watchdog.
The Guardian can reveal that three constables reported seeing Tomlinson being struck with a baton and pushed to the ground four days before video footage of the incident emerged.
The Independent Police Complaints Commission is now investigating why information provided by Metropolitan Police constables Andrew Moore, Kerry Smith and Nicholas Jackson was not passed on to its investigators.
The focus of the IPCC investigation is not likely to be the Met but City of London police, the tiny force that has jurisdiction over the Square Mile and was initially responsible for investigating Tomlinson's death on 1 April 2009.
Read more:
http://www.guardian.co.uk/uk/2011/may/09/ian-tomlinson-evidence-held-back