An incendiary device hidden in a DHL package that caught fire in Germany in July was due to be sent by air to the UK as part of a suspected Russian sabotage plot that may also have been a dry run for a similar attack on the US and Canada.

The device, reported to have been secreted in shipments of massage pillows and erotic gadgets, started a fire on the ground in Leipzig that was feared to be capable of downing a plane – similar to a package that ignited at a DHL warehouse in Birmingham on 22 July.

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Sources indicated the suspect package in Leipzig was also bound for the UK, though why the UK was chosen as the destination for the two devices, originally sent from Lithuania, is not fully clear.

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Four people were arrested in Poland as part of the alleged plot, it was announced last week, which the country’s chief prosecutor said was intended to commit sabotage using “camouflaged explosives and dangerous materials” in Europe. Two other individuals are also wanted by investigators in the country.

Another intention, according to the Polish authorities, was “to test the transfer channel” for similar parcels to be sent to the US and Canada, to see if similarly dangerous and destructive attacks could be reproduced elsewhere.

British police and officials, as well as their European counterparts in Germany, Poland and Lithuania, strongly suspect that Russia was behind the attacks as part of an effort to cause “mayhem” in the west in retaliation for western military support to Ukraine.