Latvian authorities say they detained a Belarusian citizen on an espionage charge in mid-February, saying that he allegedly collected information on Latvia's military facilities for Belarusian intelligence.
The State Security Service (SSD) made the arrest on February 15, although authorities only announced it publicly on April 11.
The SSD said it had obtained evidence showing the person gathered information about buildings used by the National Armed Forces, as well as other critical infrastructure.
The person is suspected of covertly filming and photographing the installations for Belarus's special services.
The report comes after Poland said on April 6 that it had arrested two Belarusian citizens on suspicion of collecting classified data related to Polish military infrastructure and facilities.