"In this case, we have expressed the view that the officer in question should be suspended from duty, in the public interest."
A Metropolitan Police spokesman said: "In order to maintain public trust in the police handling of public order events, a Metropolitan Police territorial support group police constable has been suspended, effective immediately, in relation to the IPCC investigation into the death of Ian Tomlinson.
Flower tributes have been left for Ian Tomlinson close to where he died
"Although the Metropolitan Police consulted with the IPCC, the decision was taken independently by the Metropolitan Police having considered all the circumstances."
Meanwhile, protester Safiullah Ghauri, 24, has told the BBC that he saw Mr Tomlinson lying on the ground in Threadneedle Street moments after he had collapsed.
He said: "I appealed to everyone to call the police paramedics... When they came some of the protesters tried to stop the ambulance coming through.
"They stood in front of it and I pushed one or two of them away and shouted at them to try to clear a way through.
"Some of the protesters were getting out of hand."
He said he thought some of the protesters' mistrust of the emergency services was a result of police behaviour during the demonstrations.
Mr Ghauri, from Hayes in Middlesex, said he left a message for the IPCC but heard nothing back.
The IPCC began an independent criminal probe on Wednesday after the first video footage of Mr Tomlinson being shoved to the ground emerged.
It has ordered a second post-mortem examination as part of the inquiry.
On Thursday the Met acknowledged Mr Tomlinson came "into contact with police" before he died.
Initially the force said it was unaware he had sustained the alleged assault and said its officers' first contact with him was when they gave him medical aid before he died.
But it denied trying to "cover up" the incident.
Some activists who participated in the demonstrations during the G20 meeting are expected to march from Bethnal Green police station on Saturday to the spot where Mr Tomlinson collapsed.
LOCATION OF IAN TOMLINSON AND G20 PROTESTS IN CITY OF LONDON
1. Protests at Bank Junction
2. Protest outside RBS branch in Threadneedle Street
This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.