Photos: Tension on and off the field for the first games of the Euro 2016

As the Euro 2016 heats up, football fans from across Europe are flooding stadiums in France. Ten French cities will host 2.5 million breathless spectators over the course of the continent’s premier international soccer championship.

Security concerns are high: the Paris fan zone is under 24/7 surveillance, and a violent row on Saturday, June 11, between Russian and English supporters landed Russia’s team with a 150,000 euro fine and suspended disqualification, the BBC reports. Tomorrow, Russia heads to another match against Slovakia tomorrow at 9am ET, Romania against Switzerland at 12pm, and France against Albania at 3pm.