A new propaganda video purported to be from al-Shabaab has urged Muslims to attack shopping centres across the UK and other Western countries.
The narrator appears wrapped in a black-and-white kaffiyeh-type scarf and wearing a camouflage jacket. His eyes have been edited to a blur in post-production, and he appears to speak with a slightly British accent during the 76-minute video posted on social media.
The authenticity of the video could not be confirmed.
Towards the end of the video, the narrator names several shopping centres including the Mall of America in Minnesota, the West Edmonton Mall in Canada and the UK's Westfield shopping centre. He also calls for Oxford Street to be targeted.
The Met said they were looking at the video.
In the US, the Department of Homeland Security Secretary Jeh Johnson called the video the "new phase" of global terrorism threat and said it was being taken seriously.
In Kenya, the government dismissed the video as dangerous propaganda.