SOFIA, Bulgaria — The prosecutor common’s workplace in Bulgaria introduced Wednesday that it was investigating a doable connection between a collection of explosions at ammunition depots across the nation and an elite group of Russian army intelligence operatives often called Unit 29155.

The 4 explosions have been a part of a collection of blasts that occurred over the previous 10 years, stated Siika Mileva, a spokeswoman for the prosecutor common. A minimum of two occurred at a time when members of the unit have been ceaselessly touring out and in of Bulgaria, she stated, and among the many broken items was army matériel belonging to Emilian Gebrev, a significant Bulgarian arms producer who, officers say, was poisoned in 2015, alongside together with his son and a senior govt at his firm, by members of the identical Russian unit.

The announcement comes simply over every week after authorities within the Czech Republic blamed two related explosions at ammunition depots in that nation in 2014 on operatives from Unit 29155, which focuses on sabotage and assassination. These depots additionally contained ammunition owned by Mr. Gebrev’s firm, Emco.

“An inexpensive assumption could be made a few hyperlink between the explosions on Bulgarian territory, the makes an attempt to poison three Bulgarian residents and severe crimes dedicated on the territory of international nations,” Ms. Mileva stated.

If the explosions have been the work of Unit 29155, they might add to an already alarming listing of operations attributed to the group. Members of the unit have been behind the 2018 poisoning of a former Russian spy named Sergei V. Skripal in Britain and an tried coup in Montenegro two years earlier. Final 12 months, The New York Instances revealed a C.I.A. assessment that the group might have carried out a covert effort to pay bounties to militants in Afghanistan for assaults on American and coalition troops.

Western intelligence providers say the purpose of all these operations is to destabilize Europe and the USA, just like the target of different Russian intelligence items that intervene in elections and hack into authorities laptop methods.

However the current revelations about explosions at ammunition warehouses level to a extra particular goal: derailing Ukraine’s efforts to acquire arms and ammunition at a time when the nation was desperately rebuilding its army to deal with Russian-backed separatists within the east of the nation.

Ms. Mileva stated that a few of the provides that have been blown up have been destined for Ukraine, signaling that Bulgaria was possible an essential provider to the nation after the warfare began in 2014.

These blasts passed off in 2015 at depots owned by a big Bulgarian arms producer known as VMZ Sopot, although Mr. Gebrev, who owns a competing producer, had saved a few of his shares there, based on Ms. Mileva.

Ms. Mileva stated that Bulgarian authorities are additionally investigating a 2011 blast at an ammunition depot owned by Mr. Gebrev’s firm that destroyed matériel destined for export to the Republic of Georgia, a rustic with which Russia had fought a warfare three years earlier. An explosion final 12 months at an ammunition depot owned by Arsenal, one other Bulgarian arms producer, can be beneath investigation, she stated. Nobody was damage in any of the explosions, she stated.

In an announcement, Emco stated it had not supposed to export weaponry to Georgia forward of the 2011 explosion and denied any connection to the blast on the VMZ Sopot depot.

However in an e-mail to The Instances final week, Mr. Gebrev acknowledged promoting ammunition and army gear to “approved Ukrainian corporations” in late 2014. Although, Mr. Gebrev insists he supplied solely a small quantity of army gear, it could have provided a lifeline to Ukraine at a time when few Western nations would supply weaponry.

There has lengthy been suspicion that the explosions in Bulgaria, a minimum of these from 2015, have been acts of sabotage. Why prosecutors are selecting to relaunch their investigation now could be unclear.

In contrast to the Czech authorities, who revealed new particulars in regards to the explosions there and expelled dozens of Russian diplomats in response, Ms. Mileva supplied little new proof and made no indication {that a} response was forthcoming.

A fireplace that broke out at an administrative constructing in Sofia, the capital, in Could 2015 destroyed proof associated to these two blasts, Ms. Mileva stated.

Bulgaria’s investigation of the explosions comes at a time of escalating confrontation between Russia and the West. For weeks, Russian troops have been massing on the border with Ukraine, although within the final week they’ve considerably pulled again. This month the USA introduced that it could expel 10 Russian diplomats and impose sanctions as punishment for an enormous breach of presidency computer systems that the White Home blamed on Russia’s international intelligence service.

Bulgaria, regardless of being a European Union member, has lengthy maintained pleasant relations with Russia, which is a important vitality provider. However just lately, there was proof that Bulgarian officers have grown weary of enjoying host to Russian intelligence operations.

In January 2020, Bulgarian authorities introduced legal expenses towards three officers from Unit 29155 for poisoning Mr. Gebrev, his son and the senior Emco govt. The three fell sick in April 2015, lower than two weeks after one of many blasts at a Bulgarian ammunition depot. An investigation decided that they have been sickened with a substance just like the Novichok nerve agent that British authorities say was utilized by officers from Unit 29155 on Mr. Skripal and his daughter in the UK.

Final month, after Bulgarian officers introduced the arrest of six folks they stated have been concerned in an espionage ring run by the Russian safety providers, the nation’s prime minister, Boiko Borisov, spoke to reporters, telling the Kremlin to knock it off.

“Cease spying in Bulgaria,” Mr. Borisov stated.

Boryana Dzhambazova reported from Sofia, and Michael Schwirtz from New York.