PARIS — France's Eiffel Tower – normally open 365 days a year – shut down Tuesday because of a strike, leaving tourists at the landmark Paris monument stuck on the ground.

The company that manages the tower says the CGT union, which represents most of the Eiffel Tower's 300 workers, called the walkout in the morning. It was not immediately clear if the strike would move into a second day.

Company director Nicolas Lefebvre told The Associated Press that management and the union are in negotiations this week over salary raises, company profit-sharing policy and other issues.

Tourists were crestfallen when they learned they would have to forgo the classic Paris thrill of a climb up the tower.

"Well, it's my first time here and actually it is our last day," said Olga Castillanos, 26, of Los Angeles. Visiting the Eiffel Tower "is the last thing we wanted to do as tourists and we were not able to do it."

The 124-year-old tower gets about 25,000 tourists daily. Though it is open every day, it occasionally closes because of suicide threats, bomb threats – or strikes.

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  • A view of the Eiffel Tower after snowfall, in Paris, Saturday, Jan. 19, 2013. (AP Photo/Zacharie Scheurer)

  • Picture of a frozen sculpture near the Eiffel tower taken on January 19, 2013 in Paris, after the snow fell over the French capital overnight. KENZO TRIBOUILLARD/AFP/Getty Images

  • Picture of a snowman built in front of the Eiffel tower taken on January 19, 2013 in Paris, after the snow fell over the French capital overnight. MEHDI FEDOUACH/AFP/Getty Images

  • A photo taken on January 19, 2013 shows the a part of the Eiffel tower in Paris after the snow fell over the French capital overnight. MEHDI FEDOUACH/AFP/Getty Images

  • Picture of the Eiffel tower taken on January 19, 2013 in Paris, after the snow fell over the French capital overnight. MEHDI FEDOUACH/AFP/Getty Images

  • People cross the Alexandre III bridge in front of the Eiffel tower on January 19, 2013 in Paris, after the snow fell over the French capital overnight. Photo credit should read MIGUEL MEDINA/AFP/Getty Images

  • Picture of a car of the company 'Voitures Jaunes', which proposes to his clients to book a car with a driver, taken near the Eiffel tower on January 17, 2013 in Paris. KENZO TRIBOUILLARD/AFP/Getty Images

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  • People take part in a march against same-sex marriage on January 13, 2013 in front of the Eiffel Tower in Paris. Tens of thousands march in Paris on January 13 to denounce government plans to legalise same-sex marriage and adoption which have angered many Catholics and Muslims, France's two main faiths, as well as the right-wing opposition. The French parliament is to debate the bill -- one of the key electoral pledges of Socialist President -- at the end of this month. LIONEL BONAVENTURE/AFP/Getty Images

  • Demonstrators leave the Champ de Mars esplanade, in front of the Eiffel Tower, at the end of a march against same-sex marriage on January 13, 2013 in Paris. Tens of thousands march in Paris on January 13 to denounce government plans to legalise same-sex marriage and adoption which have angered many Catholics and Muslims, France's two main faiths, as well as the right-wing opposition. The French parliament is to debate the bill -- one of the key electoral pledges of Socialist President -- at the end of this month. MIGUEL MEDINA/AFP/Getty Images

  • A photo taken on January 10, 2013 shows a taxi light with the Eiffel tower in the background during a nationwide demonstration in Paris to protest against legislative changes concerning the transport of sick and incapacitated passengers. KENZO TRIBOUILLARD/AFP/Getty Images

  • People pose for a photograph at the Trocadero square, with a view of the Eiffel tower in the background, on January 10, 2013, in Paris. KENZO TRIBOUILLARD/AFP/Getty Images

  • People walk at the Trocadero square, with a view of the Eiffel tower in the background, on January 10, 2013, in Paris. KENZO TRIBOUILLARD/AFP/Getty Images

  • People gather as they celebrate the New Year on the Trocadero square beside the Eiffel Tower in Paris, early on January 1, 2013. FRED DUFOUR/AFP/Getty Images

  • Tourists walk at the Trocadero square with the Eiffel tower in the background on December 30, 2012 in Paris. LIONEL BONAVENTURE/AFP/Getty Images

  • Tourists pose at the Trocadero square with the Eiffel tower in the background on December 30, 2012 at sunrise in Paris. LIONEL BONAVENTURE/AFP/Getty Images

  • View taken on December 26, 2012 of the Eiffel Tower in Paris. JOEL SAGET/AFP/Getty Images

  • A rainbow is pictured near the Eiffel tower, on December 18, 2012 in Paris. PATRICK KOVARIK/AFP/Getty Images

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  • A picture shows clouds on the top of the Eiffel tower on December 7, 2012 in Paris. LIONEL BONAVENTURE/AFP/Getty Images

  • People walk on the Trocadero square as the top of the Eiffel tower is taken in the mist on December 7, 2012 in Paris. LIONEL BONAVENTURE/AFP/Getty Images

  • Picture of a view of a giant Christmas tree at the Concorde square in Paris taken on December 6, 2012. PATRICK KOVARIK/AFP/Getty Images

  • A view of a giant Christmas tree near the Concorde square, with the Eiffel tower in the distance, on December 4, 2012, in Paris. ERIC FEFERBERG/AFP/Getty Images

  • A picture taken on November 28, 2012 shows a train driving on an elevated railroad between the "Bir-Hakem" and the "Passy" metro stations in Paris. At left is the Eiffel Tower. PATRICK KOVARIK/AFP/Getty Images

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  • A picture taken on November 15, 2012 in Paris shows the eiffel tower partly hidden in the fog. JOEL SAGET/AFP/Getty Images

  • The top of the Eiffel Tower rises above clouds and fog covering the city of Paris on November 9, 2012. ALEXANDER KLEIN/AFP/Getty Images

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  • A picture taken on September 15, 2012 in Paris shows a general view of Paris from the top of the Saint Jacques Tower (Tour Saint Jacques), opened for the first time to public, during the 29th edition of France's European heritage open days. France opens the doors of its state buildings, some usually forbidden to the public, during these European heritage days until September 16. KENZO TRIBOUILLARD/AFP/GettyImages

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  • People cool off in the Trocadero's fountains in front of the Eiffel Tower, on August 17, 2012 in Paris as the city sweltered under a summer heatwave. BERTRAND GUAY/AFP/GettyImages

  • People queue for taking the lift of the famous Eiffel Tower in Paris on August 3, 2012. FRED DUFOUR/AFP/GettyImages

  • The Eiffel tower, is pictured from the Champs de Mars on August 3, 2012 in Paris. LIONEL BONAVENTURE/AFP/GettyImages

  • A picture taken on July 31, 2012 in Paris, shows the banks of the river Seine, in front of the Eiffel Tower. French Prime Minister Jean-Marc Ayrault decided on July 13, 2012 to end the blockade, by last Prime Minister Francois Fillon, of the project to make a 2.3-km pedestrian walk on the left bank of the Seine between the Pont Royal (Royal Bridge) and Alma bridge. The project, headed by Paris's Mayor Bertrand Delanoe, is to be developed in 2013. KENZO TRIBOUILLARD/AFP/GettyImages

  • French Minister for Handicraft, Tourism and Trade, Sylvia Pinel and Jean-Bernard Bros, head of the Societe d'Exploitation de la Tour Eiffel (SETE - Company responsible for the management and operation of the Eiffel Tower) walk past the scaffoldings used for the Eiffel Tower first floor renovation during a visit as part of her summer tourist season trip on July 31, 2012, in Paris. PIERRE VERDY/AFP/GettyImages

  • A picture taken on July 31, 2012 shows the fountains of the Trocadero, in front off the Eiffel Tower in Paris. KENZO TRIBOUILLARD/AFP/GettyImages

  • A Chevrolet Impala (L) and a Fiat 500 (R) drive in front of the Eiffel tower in Paris on July 29, 2012, during a vintage cars parade as part of the fifth summer edition of the "Traversee de Paris Estivale"("Summer Paris Crossing"), the largest gathering of classic vehicles in the French capital streets. JACQUES DEMARTHON/AFP/GettyImages

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  • A general view shows the Eiffel Tower and the La Defense business district at sunset on July 14, 2012 in Paris. LOIC VENANCE/AFP/GettyImages

  • A general view shows the Eiffel Tower at night on July 14, 2012 in Paris. LOIC VENANCE/AFP/GettyImages