London (CNN) British counter-terrorism police are investigating after small improvised explosive devices were found near three major London transport hubs. The devices were sent in small packages to buildings at or near Heathrow Airport, London City Airport and Waterloo train station, police said. All the devices were judged to be viable, and in one instance, the package burst into flames when staff opened it. The Metropolitan Police said its counter-terrorism command unit was investigating the devices, which appeared to be part of a "linked series." Sadiq Khan, the Mayor of London, paid tribute to police for their response.

Source: CNN March 05, 2019 16:46 UTC