
Fans watch a Euro 2016 match on a giant screen in Lens, France, on Saturday, June 11. The small city -- population 34,190 -- is expecting 50,000 fans for the England-Wales match on Thursday, and authorities are bolstering security in light of the influx and recent fan violence in Marseille.

The Stade Bollaert-Delelis has already hosted one match this tournament: Albania-Switzerland. Its capacity is just 35,000, so many fans will have to watch from outside on Thursday.

England fans, seen here, clash with Russian fans before their match in Marseille on Saturday. UEFA's executive committee has warned both England and Russia that their teams could face further sanctions -- including potential disqualification from the tournament -- if their fans are involved in more violence.

A Russia fan lobs a chair towards England fans sitting in a cafe in Lille, France, on Tuesday. Many England fans going to Lens have to travel through nearby Lille, where Russia is playing Slovakia on Wednesday.

Fans clash in the Stade Velodrome after the England-Russia match in Marseille.

A aerial photo of Lens as seen on April 18.

Wales fans watch their tournament opener against Slovakia on Saturday.