The breakaway Moldovan region of Transdniestria raised its "terrorist threat level" to red on Tuesday and introduced checkpoints after several blasts in the region, its official news agency said.
The Russia-backed region has been hit by several attacks in the past day, local authorities say, after a military unit was targeted, blasts at Transdniestria's state security HQ and two explosions damaged old Soviet-era radio antennas.
The radio antennas had been used to rebroadcast Russian radio in the region.
Moldova's president, Maia Sandu, warned that the spate of attacks were an attempt to escalate tensions, blaming "pro-war factions" within the territory.
Speaking at a news conference after an emergency Security Council meeting, Sandu said she did not plan to talk with the Kremlin about the incidents over the past 24 hours.