After championing the rights of transgenders and supporting the 'Cause Ambassador' campaign for the rare disease LSD, K-town heart throb Karthi has joined hands with the Tamil Nadu police, to act in a short film on awareness about cyber criminals.

"When we decided to make a short film to spread awareness about online frauds, we wanted a celebrity with an instant connect to people. Most of us voted for the popular actor Karthi. Despite his busy shooting schedules, he gave his nod and did it free of cost," reveals a source from the cyber-crime wing.

Speaking to this newspaper from Erode where he is celebrating his Thala Pongal, Karthi said, "When the police approached me with the initiative, I felt it was the pressing need of the hour.

People here get e-mails from foreign tricksters who are intelligent criminals, promising them huge amounts of money in different ways, including saying that the receiver has won a bumper lottery prize and should be ready to pay some amount initially. I guess many Chennaiites are losing hard-earned money this way.

I heard an Anna University professor who got cheated to the tune of `40 lakhs, which he had kept for his daughter's wedding."

The actor appears in the beginning of the video with the message, "Beware of online criminals and watch the film, you will know."

The film features a few experts and police officials who caution netizens about tricksters who lay traps by sending fraudulent e-mails.