Organizers for Euro 2016 said Wednesday they have boosted security arrangements for the tournament after a series of terrorist attacks in Paris in November.
An average of 900 security personnel are planned per match, with a double perimeter of security around each stadium.
The French government and tournament organizers will share the task of securing the games, Euro 2016 organizing president Jacques Lambert said during a press conference held 100 days in advance of the opening game.
After terrorists, who killed more than 120 people in the November 13 attacks, chose the Stade de France stadium during the France v Germany friendly match as one of their targets, the security budget has been increased by 15 per cent.
Suicide bombers failed in their attempts to enter the stadium but the attacks have increased tension across France as the country prepares to host 1 million foreign visitors for the event.
Lambert said that while the security threat was high, "it's a fact that we have to deal with in a professional way, with sangfroid."
Many of the security plans, ongoing since 2013, were already highly developed even before the attacks put the country in a state of emergency, he added.
Euro 2016 organizers will be responsible for securing the interior of the stadiums and the state – including the Interior Ministry, the police and the gendarmes – will secure public spaces and transportation.
Around 2.5 million fans are expected to watch the 51 games spread over 10 venues in the June 10-July 10 tournament. The event is expected to generate 1.2 billion euros (1.3 billion dollars) for the French economy.
Though Europe's ruling body UEFA said Tuesday that games could be held behind closed doors in case of a terrorist threat, Lambert said that wasn't an option Euro 2016 organizers were considering.