London- The Paris prosecutor's office has started an investigation to find the Chelsea fans responsible for chanting "we're racist and that's the way we like it" as they stopped a black man boarding a Paris train on Tuesday.

The incident was captured on video by another passenger on the platform at the Richelieu-Drouot metro station before Chelsea played Paris St Germain in a Champions League match at the Parc des Princes in the French capital.

Police said no arrests were made in relation to the match, which ended in a 1-1 draw, but amateur footage posted on The Guardian newspaper website (www.theguardian.com) clearly showed the incident which has been widely condemned by the soccer authorities including FIFA president Sepp Blatter and Chelsea.

The Metropolitan Police in London have appealed for anyone with information to come forward and said in a statement that they "took offences of this nature seriously no matter where they occur."

The statement added: "We will examine the footage with a view to seeing if we can apply for football banning orders, preventing people from travelling to future matches." With the Paris prosecutor's office opening a case, both the French and British police forces said they would cooperate in identifying those involved.