Packages were received at high-profile individuals and locations, including the Prime Minister of Spain's Moncloa residence, the Ukrainian and U.S. embassies in Madrid, Torrejon Air Base, and the arms manufacturer Instalaza.
[1][9] The Foreign Minister of Ukraine Dmytro Kuleba ordered that the security of all Ukrainian embassies be increased, and urged Spain to investigate the attack.
[12] U.S. officials had also suspected Russian military intelligence officers of directing associates of a white supremacist militant group to carry out the attacks.
They stated that they believed the suspect was responsible for making and sending all six letter bombs himself, but that the possibility of "participation or influence of other people" was not ruled out.
[13] On 23 July 2024, the Audiencia Nacional sentenced the suspect, identified as Pompeyo González Pascual, to 18 years' imprisonment for sending the bombs.