Goma-2 ECO was the explosive that was used in the 2004 Madrid train bombings . Terrorist Jamal Ahmidan , also known as El Chino , bought the explosive illegally from a mine in northern Spain . It was also planned by the same cell that carried out the Madrid bombings to use the explosive to derail a high-speed train . About 80 kilograms of the explosive was used by ETA in Operation Ogro to assassinate Luis Carrero Blanco . The explosion was so powerful it threw Blanco 's car over a five story building
2004 Madrid train bombings
2004 Madrid train bombings
Goma-2