The Nigeria News Agency reports that 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 U.S. 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.
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.
Authorities have banned demonstrations, sealing off the town, but forces are on alert for any other gatherings in the region by anti-government yellow vest-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.
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.
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”.
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.
Authorities have, however, 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.
(Edited by Emmanuel Yashim)