The FA has sent a letter to England supporters to urge them to "act in a positive and respectful way" during the remainder of the Euro 2016 tournament.

England fans were involved in ugly clashes with Russia supporters in Marseille last week, and there is genuine fear tensions will rise in Lille on Wednesday.

Russia play Slovakia in the city on Wednesday, whilst England and Wales supporters are congregating in the French city ahead of their match in nearby Lens on Thursday.

Russia supporters attacked their English counterparts in Marseille. Credit: Nick Potts/PA

In the letter sent to England members, Martin Glenn, the FA's Chief Executive Officer, acknowledged not all fans were involved in the violence in Marseille but pleaded with fans "not to react to provocation".

He advised fans to avoid "isolated areas in Lille and Lens" and "continue to respect our hosts in France".

Extra police have been drafted in to Lille and there is a drinking ban in public places, with bars in the city closing at midnight.

Trouble flared briefly in Lille on Tuesday evening as England, Wales and Russia supporters were involved in a confrontation outside a bar near the city's train station.

Dear Member, > First of all let me thank you for your terrific support at the Stade Velodrome on Saturday evening.It was wonderful to be part of such a noisy and passionate England support from start to finish. > While the focus of this letter is to look forward to the Wales match on Thursday, we recognise that some of you were subjected to acts of violence from rival supporters in the stadium last weekend. It was truly appalling behaviour but you reacted admirably in difficult circumstances. We acknowledge UEFA’s ruling against the Russian Football Union today. > Turning towards ourselves, you will be aware that UEFA has warned us of our fans' contribution to the anti-social and violent scenes in Marseille leading up to the Russia match. It is something we take very seriously and while tens of thousands of you acted impeccably, there was a minority that did not. > Like the England team, you represent the badge and I urge you to act in a positive and respectful way. > We are all excited by the prospect of the derby match against Wales on Thursday. However, given the events mentioned and the close proximity of our match to Russia v Slovakia in Lille on Wednesday afternoon, a high-level security meeting was held today in Lille by UEFA, the French authorities, UK police with ourselves and The Football Association of Wales present. > The authorities have implemented the following measures:

The FA