The man who pointed a gun at another motorist at the government complex on Chaeng Watthana Road has been identified as a high-level official of the National Anti-Corruption Commission (NACC) after a video clip of the incident went viral on social media.
Media reports quoted NACC secretary-general Worawit Sookboon as saying the road-rage driver was assistant secretary-general Piset Nakapan, and he had ordered Mr Piset to make a report on the incident immediately.
Mr Worawit said he had watched the video, in which the driver of a black Honda Accord car drew a pistol and pointed it angrily at the driver of the car behind him in the grounds of the government centre in Bangkok's Laksi district.
Pol Col Parinya Lueang-uthai, chief of Thung Song Hong station, was quoted as saying the owner of the Honda car lived in Thanyaburi district of Pathum Thani and police would bring him in for interrogation.
If it was a fake gun, he would be charged with intimidating another person. If it was a real gun, he would face firearms-related charges, Pol Col Parinya said.
A video of the incident was posted on a Facebook page titled hia khab rod (water lizard driving a car) on Monday. Voices were muted in the dashboard camera clip, which was dated last Wednesday afternoon.
Subtitles on the clip explain the vehicle with the dashcam travelled along Chaeng Watthana Road from Prapa Canal and turned right into the government complex.
The black Honda car followed as they entered the complex grounds. As the dashcam driver slowed down in the face of oncoming traffic, the driver travelling behind suddenly hooted the horn and overtook, travelling fast in the left lane.
After being followed by the dashcam car, the driver of the black Honda car is seen stopping, getting out, gesturing angrily and pointing a pistol at the following vehicle. A woman passenger also gets out and glares, pacing back and forth.
When two security guards quickly show up, the armed man is hustled back into his car by the woman, who also gets back in before the clip ends.