Three citizens of Lithuania have been detained for selling information about military and strategic facilities of the Baltic republic to Russian special services, reported Lrytas news agency.
The suspects were detained in connection with two separate pre-trial investigations.
The first investigation concerns a civilian employee of the Šiauliai Military Base, who previously served in the Lithuanian Air Force, as well as a citizen of Lithuania with a residence permit in a foreign country.
The second investigation also concerns a Lithuanian citizen suspected of passing on information about the naval facilities.
The investigations into these cases began in December. Dozens of searches have been carried out in connection with them.
If the suspects are found guilty, they face up to 15 years in prison.
Since 2014, a total of 12 people suspected of espionage have been detained in Lithuania.