A video uploaded to YouTube on Sunday documents some dramatic moments from the terror attack at the Westgate Mall in Nairobi, Kenya.

Mobile phone video footage that was taken in a supermarket in the mall shows terrified victims cowering behind shopping aisles and under tables as gunshots and explosions are heard in the background.

One man is pictured on his mobile phone alerting someone that he believed "terrorists" were inside the mall.

Others are heard screaming and a member of staff is heard advising a customer: "Don't go out."

The Somali Al-Qaeda-affiliated terrorist group Al-Shabaab has claimed responsibility for the attack.