It was filmed by a staff member at one of the hotels where the shootings took place.
The unnamed hotel worker chased Seifeddine Rezgui moments after he slaughtered 38 innocent tourists including 18 Britons.
The man can be seen running after Seifeddine Rezgui as the ISIS militant selects his targets.
At one point he even picks up what appears to be a bottle of olive oil as he attempts to sneak up behind the 23-year-old assassin to disarm him.
The 11-minute video was released as Tunisia made its first arrests in connection with the terror attack.
Tunisia’s Interior Minister Najem Gharsalli said: “We have started by arresting a first group, a significant number of people, from the network that was behind this terrorist criminal.”
Najem Gharsalli added that officials were still verifying whether Seifeddine Rezgui had been trained in Libya in jihadist camps.
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