Interior Minister Angel Acebes (search) confirmed Saturday that the bomb found at a high-speed rail line a day earlier was made of the same type of explosives used in the Madrid (search) terror bombings.
"The explosives are the same as those used on March 11, but at this moment the investigation is continuing ... to try to determine who is behind it," Acebes told reporters in Madrid.
Train service was restored Saturday after being interrupted a day earlier by the discovery of a 26-pound bomb hidden in a bag, the state rail company said.
Investigators have said the March 11 (search) bombings were carried out with Spanish dynamite — Goma 2 Eco. The attack killed 191 people and injured 1,800.