In a new video released by Somali-based terror group Al Shabaab, the Al Qaeda affiliate urged "their Muslim brothers" to attack Western shopping centers, including the Mall of America and Canada's West Edmonton Mall.

Homeland Security is reportedly taking the threat seriously, DHS Secretary Jeh Johnson telling CNN, "Anytime a terrorist organization calls for an attack on a specific place, we've got to."

The call to action came at the end of an hour-long propaganda film about 2013's Westgate Mall shooting in Nairobi, which Al Shabaab has previously claimed responsibility for.

"Imagine what a dedicated mujahideen in the West could do to the American or Jewish-owned shopping centers across the world," says the masked figure, who then names specific targets as their geographic coordinates flash on screen.

In response to the video, the Mall of America is reportedly working with Homeland Security and the FBI and taking "extra security precautions—some visible to guests and others that are not."

Appearing on CNN Sunday morning, Secretary Johnson explained how a group like Al Shabaab, which has limited capabilities outside East Africa, could pose a legitimate threat to Americans:

This latest statement from Al Shabaab reflects the new phase we've evolved to in the global terrorist threat, in that you have groups such as Al Shabaab and ISIL publicly calling for independent actors in their homelands to carry out attacks. We're beyond the phase now where these groups would send foreign operatives into countries after being trained some place.

Secretary Johnson also asked Mall of America shoppers to "to be particularly careful" today, but a DHS spokesperson later clarified his remarks, saying, "Sec. Johnson didn't say that they should not go to the mall, he told shoppers to be extra vigilant and that security was increased."

[Image via YouTube]