GRAPHIC CONTENT: First Footage Of Massacre In Kenya's Westgate Mall Attack

Shocking footage has emerged of the moment a terrorist mercilessly gunned down a shopper in last month's bloody attack at a Kenyan shopping mall. 

Surveillance video obtained exclusively by CNN from a supermarket in the Westgate shopping centre shows the moment terrified men, women and children ran for their lives from the attackers.

One man cowers in front of a cashier desk, but he is immediately spotted by one of the terrorists who shoots him at close-range and walks away. The injured man drags himself up to a sitting position, but falls back on to the tiled flooring. The gunman soon returns and shows the terrified man no mercy, shooting him again. 

See more photos below and watch video Here