Small letter bombs were discovered on Tuesday in various locations in London. The anti-terrorist unit determined. Envelopes containing small yellow plastic bags were found near London City Airport, Heathrow Airport and Waterloo Station.
These were explosives capable of causing minor fires, Scotland Yard said. But no one was hurt.
The police assume that the three incidents are interrelated. At first nothing was known about a motive. The air and rail traffic were not affected.
One of the A4 envelopes went up in flames when opened by a member of staff at Heathrow Airport. The building, which is not located directly on the airport, has been evacuated.
The envelopes at London City Airport and Waterloo Station could be defused, without the explosives were triggered. At the City Airport, a building was temporarily evacuated as a precaution.
At Waterloo Station, a small area outside the station was closed off.