A student at a military academy in Russia's second city Saint Petersburg has been arrested and charged with "complicity in terrorism", a court said today.
Cadet Vadim Osipov was ordered to be held in custody until June 9 as investigations continue, the press office for the military court said, without giving more details about the case.
The announcement of the arrest comes in the wake of a deadly bomb attack on the city's metro system on April 3 that killed 14 people.
Officials made no link between Osipov's detention and the metro bombing.
Authorities have blamed that attack on 22-year-old Akbarjon Djalilov, thought to be a Russian national born in Central Asian Kyrgzstan, who died in the blast.
The has been no claim of responsibility for the attack but investigators say they are probing possible links to Islamic State jihadists.
Eight people -- all from mainly Muslim Central Asia -- have been detained in Moscow and Saint Petersburg over alleged involvement in the attack.
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