SANTO DOMINGO, Dominican Republic (AP) - Authorities said Saturday that more discussions are needed before a Spanish research team can examine a tomb purportedly holding Christopher Columbus' remains, setting back efforts to determine if claims that he is buried in Spain are true. The government initially had agreed to reopen the tomb on Feb. 15, but authorities later backtracked after the event was heavily publicized. Dominican authorities were upset with reports that researchers would do more than visually inspect the bones. The dispute over which set of remains are authentic has simmered for more than 100 years. The tomb is...