** FILE ** People form a human chain in Barcelona, Spain Wednesday Sept. 11, 2013. Several hundred thousand people demanding an independent Catalonia have joined hands to form a 400-kilometer (250-mile) human chain across the northeastern region of Spain. (Associated Press)
Rafael Nadal, of Spain, hits autographed balls to fans after beating Richard Gasquet, of France, during the semifinals of the 2013 U.S. Open tennis tournament, Saturday, Sept. 7, 2013, in New York. (AP Photo/Charles Krupa)
Roger Federer, of Switzerland, right, and Tommy Robredo, of Spain, walk off the court during a break in play during the fourth round of the 2013 U.S. Open tennis tournament, Monday, Sept. 2, 2013, in New York. (AP Photo/Darron Cummings)
Sergio Garcia, of Spain, hits from the fourth tee during the third round of the Deutsche Bank Championship golf tournament in Norton, Mass., Sunday, Sept. 1, 2013. (AP Photo/Michael Dwyer
Agnieszka Radwanska, of Poland, greets Maria-Teresa Torro-Flor, of Spain, at the net after winning their second-round match at the 2013 U.S. Open tennis tournament, Wednesday, Aug. 28, 2013, in New York. (AP Photo/Kathy Kmonicek)
In one of the worst crashes in recent European history, scores were killed and many others were wounded when a train speeding around a curve derailed in Spain. American regulators are examining the accident to help improve rail safety in the United States. (associated press)
Spanish investigators — and U.S. regulators — are examining the July 24 accident in northwestern Spain in which scores of people were killed after a speeding train left the tracks. The determination was operator error, perhaps the most significant danger on railways worldwide. (Associated Press)