Counter-terror police are investigating three packages containing explosives found at Heathrow Airport, London City Airport and Waterloo station.
The “small improvised explosive devices” were found in A4 postal bags, the Metropolitan Police said.
The force’s Counter Terrorism Command is treating it as a “linked series” and “keeping an open mind” about motives.
Irish police are assisting the Met as the Heathrow and Waterloo packages had Republic of Ireland stamps
‘The motive is unclear. It could be anything from Irish republicanism to a grievance against transport companies. Other possibilities include someone with strong opinions about Brexit or someone with mental health problems’
- BBC News Home Affairs Correspondent Daniel Sandford
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