Counter-terrorism police are investigating whether Russian spies planted an incendiary device on a plane to Britain that later caught fire at a DHL warehouse in Birmingham, the Guardian can reveal.

Nobody was reported injured in the fire on 22 July at a warehouse in the suburb of Minworth that handles parcels for delivery, and the blaze was dealt with by the local fire brigade and by staff.

The parcel is believed to have arrived at the DHL warehouse by air, though it is not known if it was a cargo or passenger aircraft, nor where it was destined for. There could have been serious consequences if it had ignited during the flight.

A similar incident occurred in Germany, also in late July, when a suspect package bound for a flight caught fire at another DHL facility in Leipzig, and investigators are looking at links between the two. German authorities warned this week that had the parcel caught fire mid-air it could have downed the plane.

…

British investigators suspect that the incendiary device is part of a wider campaign that Russian spies have been carrying out across Europe this year, which has been condemned as rash and careless by spy chiefs in the UK and elsewhere.

Ken McCallum, the head of MI5, warned last week that Russia’s GRU military intelligence appeared to be on “a sustained mission to generate mayhem on British and European streets: we’ve seen arson, sabotage and more”.

The British spy chief accused Russia of engaging in “dangerous actions conducted with increasing recklessness” and argued that the plotting was counter-productive for the Kremlin because it was “driving increased operational coordination with partners across Europe and beyond”.

Russia’s motive appears to have been to try to inflict a cost on western allies of Ukraine, though the plots are at times precise and at others poorly coordinated and amateurish. But the Kremlin usually denies it is engaged in sabotage activity and has in the past dismissed its accusers of engaging in conspiracy theories.