Warning: video shows Andrey Karlov being shot.
Rusya Büyükelçisini vuran kişi: "Beldelerimiz güvende olmadıkça sizler güvenliği tadamayacaksınız, Halep'i Suriye'yi unutmayın." pic.twitter.com/tysdMO8LKG— 140journos (@140journos) December 19, 2016
A short while ago, Belgian police put the Schaerbeek district of Brussels into lockdown while they carried out a security operation.
At around the same time, a lorry was driven into a Christmas market in Breitscheidplatz in Berlin killing at least 9 people and injuring at least 50 more according to social media reports.
Un camion a foncé dans la foule #MarcheDeNoel à #Breitscheidplatz à #Berlin Plusieurs morts et blessés #Allemagne— ~Virginie (@virgini_c) December 19, 2016
Chauffeur en fuite pic.twitter.com/AkhvO1vVYC
On Friday 200 SAS troops carried out undercover public protection operations in key cities in the UK in response to intelligence from MI5 suggesting an attack was imminent.