Spanish police on Wednesday arrested a 74-year-old man suspected of sending letter bombs to the Ukrainian and American embassies and several institutions in Spain in November and December, the interior ministry said.
The man, a Spanish national, was arrested in the northern town of Miranda de Ebro and police are still searching his home, the ministry said in a statement, without giving further details.
One person was slightly injured by a letter bomb at the Ukrainian embassy in Madrid.
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Between November 24 and December 2, a total of six packages containing explosives were sent to targets including Prime Minister Pedro Sanchez, government offices, a European Union satellite agency and the United States Embassy.
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Russian Imperial Movement
The arrest came three days after the New York Times reported that investigators had focused their investigations in recent weeks on the Russian Imperial Movement, a radical group with ties to far-right organizations in Spain.
He is also suspected of being connected to the Russian secret services.
Spanish authorities declined to comment on the report, while a senior judicial source denied knowledge of this investigative angle.