Currently, everything indicates that the suspect allegedly acted independently, the Spanish law enforcement officers found out.

It became known who could send letters with explosives in Spain. The country’s police arrested this Wednesday, January 25, a 74-year-old pensioner, who is suspected of sending six letters with pyrotechnic material in late November and early December, in particular addressed to the Embassy of Ukraine and Prime Minister Pedro Sanchez.
According to investigators, the arrested man is a Spanish citizen, before his retirement in 2013 he worked as an official in the city council of the city of Vitoria and had technical and computer skills, about it writes El Pais publication with reference to the Ministry of Internal Affairs.
Police say so far all indications are that he allegedly acted alone and is not known to be associated with any gang, although they have not ruled out the involvement or influence of other people.
In the morning, agents searched his house in the city of Burgos, where the suspect lived alone and where he allegedly made letters using pyrotechnic material.
The letters were addressed to Pedro Sanchez; Minister of Defense Margarita Robles; the ambassadors of Ukraine and the USA, Serhii Pogoreltsev and Julissa Reynoso, respectively; to the director of the Instalaza arms company, the manufacturer of S-90 grenade launchers, which Spain sent to Ukraine as part of military aid; and the person in charge of the Torrejón de Ardos Air Base Satellite Center in Madrid.
Sending dangerous letters in Spain – what is known
As UNIAN reported, on November 30, an envelope exploded in the hands of the commandant at the Embassy of Ukraine in Spain during an inspection. Employee of the embassy received minor injuries and was hospitalized, there are no threats to his life. The rest of the embassy staff were not injured.
Minister of Foreign Affairs Dmytro Kuleba ordered to strengthen the security of all Ukrainian embassies abroad. The minister also emphasized that whoever was behind the organization of this explosion, “they will not manage to intimidate Ukrainian diplomats or stop their daily work on strengthening Ukraine and countering Russian aggression.”
On December 2, it became known that the embassies and consulates of Ukraine in various European countries letters with animal eyes began to arrive.