This is the terrifying moment a wild monitor lizard sparked panic by storming into an office.

The 6ft long beast ran into the courier company’s building in the middle of the day on the island of Koh Samui, in southern Thailand, on November 20.

CCTV video captured shocked female staff screaming as the Godzilla-like reptile whipped its razor sharp tail and hurled itself against a glass door.

One woman ran outside while another stood on her table and a third hid in the corner of the room as she frantically called for help.

One of the terrified office girls said they thought the snarling monitor lizard – which are known to bite humans – would attack one of them.

She said: ‘This is the scariest thing that has ever happened in the office. I get scared when I see a tiny house lizard in the room smaller than my finger. So when the monitor lizard ran in, my heart leapt out of my chest. I really thought it could attack us.’

Animal handlers arrived and the monitor lizard left on its own without being hurt.

Asian water monitor lizards live in canals and ponds in large cities in Thailand where they feed on fish, snakes, frogs and scraps of food left by humans. They are aggressive when threatened and have a mildly venomous bite which sometimes carries harmful bacteria.