The Basque separatist group, ETA, was behind the two explosions today along the Tour de France route in northern Spain, Spanish intelligence sources tell the Blotter on ABCNews.com. The small explosions caused no injuries when they were detonated along kilometer 51,450, about half a mile inside the Spanish border. At the time of the blasts, the main part of the race had passed, and the rest of the riders passed a half-hour later without any interruptions or problems. Blotter Summer Terror Reigns in Spain: Cease-fire Ends, Bomb Campaign Expected The explosions followed a telephone bomb threat and only caused small rock slides. As previously reported on the Blotter, the terror group called off its March 2006 cease-fire with Spain and declared it was resuming its violent campaign for independence last month. Just more than two weeks after that, Spanish authorities seized a carload of explosives with a "manual on bomb making written in the Basque language" inside Spain’s border, apparently showing the terror group was making good on its promise to step up its campaign for independence. Despite the explosions, Tour de France, a favored target of the ETA, was once again embroiled in controversy when a second rider in as many days failed his doping test. Do you have a tip for Brian Ross and the Investigative Team?