Poland’sNational Prosecutor’s Office has confirmed four arrests after parcels “containing explosives” were allegedly sent via courier companies to countries including the UK.

Counter-terror police in the UK are already investigating whether Russia had any involvement after a suspicious package caught fire at a DHL warehouse in Minworth in July.

Authorities in Germany are also examining several fires thought to have been caused by incendiary devices hidden inside parcels at a warehouse in Leipzig.

Polish Prosecutor Katarzyna Calow-Jaszewska said the latest arrests were related to parcels “which spontaneously ignited or detonated during land and air transport” to EU countries and the UK.

She said the group’s goal was allegedly “to test the transfer channel for such parcels, which were ultimately to be sent to the United States of America and Canada”.

She added that four people involved in “sabotage” and “of an international nature were detained”.

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