STRASBOURG, France, May 2 (Reuters) - Vandals desecrated around 20 graves with Nazi slogans in a Roman Catholic cemetery near the French border with Germany, police said on Sunday, two days after a similar incident at a nearby Jewish cemetery. The two incidents appeared unrelated. Nazi swastikas daubed around the Catholic cemetery in the village of Niederhaslach, west of Strasbourg, were the wrong way around -- unlike those at the Jewish cemetery, where 127 graves were desecrated. "It doesn't look at all like we're dealing with the same sort of context," one policeman said, adding that the Niederhaslach incident could...