This is the horrific chilling moment a gunman who killed six people in a mass shooting at a Bangkok market stalked his victims before their deaths.

The deadly incident occurred at a popular fresh food market in Thailand's capital at around 1pm local time on Monday, police said.

Local media is currently reporting that the shooting took place at the Or Tor Kor market in Bangkok’s Chatuchak district, a popular destination for tourists.

The perpetrator, who is reportedly a 61-year-old man named by police as Nai Noi, took his own life following the attack.

In haunting footage taken at the scene, Noi was seen wearing a black T-shirt and cream shorts while wearing a camouflage-patterned backpack on his front.