More than 13,000 police arrive in town with authorities saying any unrest will not be tolerated

The French seaside resort of Biarritz is under lockdown by security forces ahead of the G7 summit, with more than 13,000 police as well as a special magistrates court set up to try anyone committing offences.

The historic centre of the Basque town was emptied of tourists on Friday before the arrival of leaders of the world’s advanced economies including the US president, Donald Trump, and the UK prime minister, Boris Johnson, who will hold three days of talks on global issues from the climate emergency to trade wars.

Q&A What is the G7? Show Hide Meeting regularly since 1976, the G7 is made up of seven countries: Canada, France, Germany, Italy, Japan, the UK and the US. Between them, the countries represent around half of the world’s GDP, and the group’s main purpose is to provide a forum for discussing world economic stability. The first meetings grew out of a series of summits to deal with the 1973 oil crisis. G7 summits take place annually, with the host nation rotating between the members. Summits are usually attended by leaders, finance ministers and central bank governors. As well as the seven nations, the meetings are also usually attended by leaders from the European Union, and representatives from international financial institutions including the International Monetary Fund and the World Bank. As well as the high-profile summits, the finance ministers from the G7 also meet on a regular basis several times a year. Between 1998 and 2014 the grouping was known as the G8, and also included Russia among its members. However, Russia was expelled in 2014 following the annexation of Crimea.

Martin Belam

Surfers were ordered out of the water on the central beach, the Grande Plage, and sent further round the coast. Sailing vessels were moved on and kept away. The train station and airport will be closed over the weekend, creating a no-go zone in the centre. There are road checks at the Spanish border and police have been stationed around town and on top of buildings.

Facebook Twitter Pinterest Surfers have been ordered to catch a wave further round the coast. Photograph: Ian Langsdon/EPA

Authorities have banned demonstrations, sealing off the town, but forces are on alert for any other gatherings in the region by anti-government gilets jaunes (yellow vests) protesters or possible anarchists.

“The aim is to have maximum security with a minimum of disruption. We will not tolerate any unrest. If it happens, we will respond,” said France’s interior minister, Christophe Castaner.

Riot police clashed with activists and fired tear-gas in Urrugne near the Spanish border on Friday night, on the edge of a camp where people were staying for an alternative G7 summit focusing on environmental issues. Authorities said 17 people were arrested for an unauthorised gathering and for covering their faces. The authorities said four police were slightly injured.

A special magistrates court, with 17 prosecutors and cells that can hold up to 300 people, has been set up to deal with those arrested.

Macron thinks he can handle Trump, but G7 will put that to the test Read more

Earlier this week, five people including “black bloc” anti-capitalists were arrested for posting messages online encouraging attacks on a hotel accommodating police during the summit.

Amnesty International warned on Friday that “the hasty construction of prefab holding cells in front of the Bayonne courthouse and the arrival of numerous prosecutors and extra judges was a sign of measures that could lead to massive indiscriminate arrests and fast-track judgments”.

Facebook Twitter Pinterest The French military sweeps for potential mines along the beach. Photograph: Peter de Jong/AP

Some locals likened the closing down of Biarritz in peak holiday season to trying to hold an international summit at Cannes during the film festival. But authorities argued that the international attention would bring in more tourists in the future – appealing particularly to Americans and Canadians.

An authorised demonstration by charities, climate change campaigners and other groups on the left will take place on Saturday, but 19 miles (30km) from the summit where leaders will meet at the luxury Hôtel du Palais.

Thousands of people are expected to march from the seaside town of Hendaye over the border to Irun in Spain, where another 3,000 police officers are expected to be on duty. Several gilets jaunes groups have called for protests in France on Saturday but it is unclear where.

Asked this week whether the G7 now resembled an ivory tower of leaders cut off from the people and the rest of the world, the French president, Emmanuel Macron, said the summit was about finding spaces for dialogue and some of its work was being opened up to civil society groups and NGOs.