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WARNING - DISTRESSING CONTENT: Gunman Wallas Gomes de Lima is on the run after killing the 23-year-old porter Guilherme Alves Pereira
An armed security guard fatally shot a colleague in the head after the pair argued over a piece of paper.
Distressing CCTV caught security guard Wallas Gomes de Lima walking over to porter Guilherme Alves Pereira.
The security guard can be seen pointing the gun at Mr Pereira's head and forcing him to turn away with his hands up.
The gunman then speaks to Mr Pereira briefly before opening fire at point blank range, shooting the 23-year-old in the head.
He falls to the ground in a heap before the security guard fires two more shots into his skull before and calmly walks away.