In the footage, released last night, Somalia’s extremist group al-Shabab says the 2013 attack on the Westgate Mall in Nairobi, Kenya, was in retaliation for Kenyan military involvement in Somalia.
|Mall of America|
A masked narrator in the 76-minute clip warns of more attacks in Kenya and calls on Muslims to attack shopping centres, specifically mentioning Oxford Street and the Westfield centre.
He also listed the Mall of America in Minnesota and West Edmonton Mall in Canada as potential targets.
Security has reportedly been increased at the sites in the US and Canada but the Met Police said it does not comment on security.
A Met spokesman said: “The MPS Counter Terrorism Command is aware of the video and is assessing the content.
“We remind the public that downloading extremist material may constitute an offence.”
The authenticity of the video could not be verified.