FILE PHOTO - Products are moved on conveyer belts inside Amazon's main fulfillment center in San Fernando de Henares, near Madrid, Spain, November 10, 2015. REUTERS/Sergio Perez

MADRID (Reuters) - Over one thousand Amazon AMZN.O workers in Spain plan to stage their first strike with a two-day walkout to protest what unions claim are efforts to reduce employees' rights, union Comisiones Obreras (CCOO) said on Tuesday.

The strike, which has been called by Spain’s largest union CCOO together with other unions, will take place March 21 and 22 and will include 1,100 workers at Amazon’s San Fernando logistic warehouse on the outskirts of Madrid, CCOO said.

The union claimed the company aims to block salary increases, cut wages and reduce payments for those working weekends or holidays as part of a new contract agreement.

Workers at Amazon sites in Italy and Germany held strikes during the busy shopping day of Black Friday last year.

Amazon Spain said that it has held direct talks with the unions, adding that the company offers a competitive pay structure.