Interior Minister Vladimir Naumov said pornographic materials were seized during a search on July 25 of the home of the embassy employee, who has not been identified.
The Latvian Foreign Ministry said the raid was a breach of an international convention on the treatment of diplomatic staff.
The row comes at a time when Belarus' authoritarian regime is increasingly shunned by Western nations.
(dpa)
Minsk, March 25
THE AUTHORITIES GET TOUGH: RFE/RL's Belarus Service filed these images from the police action against the March 25 demonstration in Minsk. Photographs by Maks Kapran.
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