Under the terms of the agreement, the budget allocated to security at the fan zones is set to double from to €12 million (£9.3 million/$13.6 million) to €24 million (£18.6 million/$17.2 million), which is hoped will ensure that necessary measures are taken to ensure spectator safety.

The Eiffel tower fan zone for the tournament, which is due to take place between June 10 and July 10 across 10 French cities, will be entirely fenced.

Pat-down inspections, filtering, magnetic control and police dog units will also be enforced at the fan zones, with around 400 private security officials due to be used alongside police and the gendarmerie.

“In the context of the Vigipirate high alert antiterrorist plan, an important security system is necessary,” said Martins.

“For more than a year, we have been working on its elaboration with the Police Authority and all the other stakeholders.

“Though this aspect is now an integral part of the specifications and is approached seriously and rigorously, the question of its financing remained unsolved.”

Martins expects that thousands of visitors from across France, Europe and around the world would attend the tournament, despite security concerns ahead of the continent's major football tournament.

The concerns were raised following November's terror attack in Paris, which saw 130 people killed in the French capital, with one of the targets in the 2024 Olympic bid city being the Stade de France - which is due to stage matches at the European Championships, including the final on July 10.

There were also suggestions that matches could be played behind closed doors because of the terrorism threat, after attacks in Brussels last month left 34 people dead.

French National Olympic and Sports Committee (CNOSF) President Denis Masseglia is hopeful that the 24-team football tournament will pass without incident.

He believes a successful staging would also help to allay safety concerns, with Paris bidding to stage the 2024 Summer Olympic and Paralympic Games.

“It is important to prove our systems and to guarantee the safety of everyone,” Masseglia said.

“The Paris marathon was a success and we hope for the Euro Championships that it will be the same.

“But it is not because you are successful in one organisation [of an event], that the next you do not have to be careful.

“We will live a long time with concerns about security, it will be one part of the appreciation and part of the cost of the Games.

“We are in a permanent high level or security and it would be that way at the Games.”

Paris is facing competition from Budapest, Los Angeles and Rome for the right to stage the Games.