According to the La Sexta TV channel, the man lived in the village of Miranda de Ebro.
On November 30, an explosion occurred at the Ukrainian Embassy in Madrid.
One employee was injured, he received minor injuries.
According to reports, an explosive device hidden in the parcel went off.
It was also reported that the Spanish police on November 24 intercepted an envelope sent to Spanish Prime Minister Pedro Sanchez with a "pyrotechnic substance."