Russia suspected of sending incendiary devices on US- and Canada-bound planes, Wall Street Journal reports

(CNN) — Incendiary devices that ignited in Germany and the United Kingdom in July were part of a covert Russian operation that aimed to start fires aboard cargo and passenger flights heading to the US and Canada, the Wall Street Journal (WSJ) reported Monday, citing Western security officials.

In July, device explosions at DHL logistics hubs in Leipzig, Germany, and Birmingham, UK, kickstarted a race to find the suspects, WSJ reported.

When asked about the incidents, a spokesperson at DHL Express told CNN the company is “aware of two recent incidents involving shipments in our network,” adding they are “cooperating with the relevant authorities.”

The devices, which were reportedly electric massagers implanted with a magnesium-based flammable substance, were sent to the UK from Lithuania and “appear to have been a test run to figure out how to get such incendiary devices aboard planes bound for North America,” the WSJ reported.

Speaking at a Tuesday news conference, Kremlin spokesperson Dmitry Peskov called the WSJ’s reporting “unintelligible hoaxes which are never supported by any credible information.”

Asked about the alleged Russian plot, a US government official told CNN that “at this time, there is no current active threat targeting U.S.-bound flights.”

Polish authorities in October said four people had been arrested under suspicion of being involved in international sabotage and a sabotage group, according to a statement from the national prosecutor’s office. An international search has been initiated for two more suspects.

The Polish statement, which does not name the sabotage group, says “parcels containing camouflaged explosives and dangerous materials” were sent via courier to the UK and European Union countries and “spontaneously ignited or detonated during land and air transport.”

It adds that the group’s goal “was (also) to test the transfer channel for this type of shipments which were ultimately to be sent to the United States of America and Canada.”

A UK counter-terrorism police spokesperson confirmed to CNN that they are “investigating an incident at a commercial premises in Midpoint Way” in Birmingham: “On Monday, 22 July, a package at the location caught alight. It was dealt with by staff and the local fire brigade at the time and there were no reports of any injuries or significant damage caused,” the spokesperson said.

The spokesperson added that the investigation is ongoing, and they are “liaising with other European law enforcement partners to identify whether this may or may not be connected to any other similar-type incidents across Europe.”

CNN reported in July that Russia has been engaged in a “bold” sabotage operation across NATO’s member states for more than six months, targeting the supply lines of weapons for Ukraine and the decision-makers behind it, according to a senior NATO official.

Multiple security officials across Europe describe a threat that is metastasizing as Russian agents, increasingly under scrutiny by security services and frustrated in their own operations, hire local amateurs to undertake high-risk, and often deniable, crimes on their behalf.

CNN’s Anna Chernova contributed to this report.

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This story has been updated with additional developments.