Hosts to foot Euro 2016 fan security bill

Spending on security at fan zones during the European Championship in France will be shared by the host cities, the government and European soccer's ruling body, UEFA, say.

Deputy Paris Mayor Francois Martins said the agreement was reached on Wednesday, underlining "the joint commitment and sense of responsibility" of the parties involved.

France remains on high security alert following the November attacks in Paris that killed 130 people and injured hundreds more, and the security budget for the June 10-July 10 tournament has doubled from 12 million euros ($A18 million) to 24 million euros.

The extra investment ensured the "necessary and appropriate" security measures would be put into place, Martins said.

Fan zones are where spectators without match tickets gather to watch games on large screens, and five million are expected to visit the open-air areas across 10 cities during the tournament.

The fan zone in Paris, in the Champs de Mars near the Eiffel Tower, will be able to hold 92,000 people and will be surrounded by barriers.

Fans entering there will undergo similar security checks to matches at the Stade de France, undergoing pat-downs and bag searches at two different points before entering.

Private security guards will be employed to back up the police at fan zones.