Police in Tamil Nadu’s Madurai said, They are investigating the contact numbers on the mobile phone of the 19-year-old college student, who committed suicide after playing the deadly Blue Whale challenge, and the members of a WhatsApp group he was a part of.

Madurai SP Manivannan confirmed Blue Whale challenge was the cause of the suicide after a tattoo of a whale, made using a sharp object, was found on his left hand. Participants of the game have to complete a series of dangerous self-harming challenges over a period of 50 days and “win” the game by committing suicide.

J Vignesh, a second year BCom student in Mannar Thirumalai Naicker College, was found hanging from a ceiling fan on Wednesday by his father J Jayamani. The boy used his mother’s saree to hang himself.