An employee at Ukraine’s embassy in Madrid has been injured Wednesday in an explosion, Ukrainian officials say. 

The incident happened while the man was handling a letter, according to a Ukrainian Ministry of Foreign Affairs spokesman. 

"An explosive device hidden in an envelope detonated inside the embassy of Ukraine in Madrid," Oleg Nikolenko wrote on Twitter. 

"Foreign Minister Dmytro Kuleba instructed to strengthen the security of all Ukrainian embassies," Nikolenko added. "He also called on the Spanish authorities to urgently investigate this attack." 

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The individual suffered light injuries and went to a hospital on his own accord, Reuters reports, citing local authorities. 

There were no other reported injuries. 

In a statement to the Financial Times, Nikolenko also said Kuleba "stressed that whoever was behind the organization of this explosion will not succeed in intimidating Ukrainian diplomats or stopping their daily work on strengthening Ukraine and countering Russian aggression."