A teacher at a public school in Samut Prakan has been arrested for allegedly selling pornographic videos on social media, some showing him having sex with schoolgirls in uniform.

According to police, he admitted to having earned about one million baht over the last year from the videos.

Cyber crime police arrested Natdanai, 28, in Bangkok on Tuesday on charges of putting pornographic data into a computer system, possessing child pornographic material for sexual and commercial purposes and sharing child sex videos for commercial purposes.

Arresting officers seized mobile phones, a computer, SIM cards, bank account books and other items from his room.

Mr Natdanai teaches social science to Prathom Suksa 4 (Grade 4) students at a primary school in Samut Prakan, police said. His surname was not given.

The arrest followed information from Hug Project Thailand that a 17-year-old girl had sought help after someone using VK social media platform under the names “Wakanda’’ and "T’Challa’’ shared porn clips of her on social media.

When she contacted that person to delete the videos, the person demanded money from her, and  asked her to contact him via video in an obscene manner. The girl said she was told to take a photo of herself with her ID card and send it to him online. He instead posted her clips online.

Police ordered the investigation that revealed Mr Natdanai was the administrator of the two pages.

The suspect allegedly admitted to having opened seven pornographic pages on the social media platform and posting 1,823 video clips over about one year. Each page had more than 200,000 followers and those wanting to view porn videos were told to pay a 1,500 baht membership fee for one year's access.

The arresting team found a hidden camera in his bedroom and videos showing him having sex with students in girl scout uniforms.