Police are issuing warnings about a sick suicide “game” called the “Momo” challenge that has been spreading on WhatsApp.

According to Fox News, “Momo” is a viral challenge that asks people to add a contact via WhatsApp, and are then urged to hurt or kill themselves.

The Buenos Aires Times is reporting that police in Argentina are investigating whether “Momo” is linked to the suicide of a 12-year-old girl in Escobar.

The girl apparently filmed herself prior to hanging herself from a tree in her backyard. Authorities think someone encouraged her to kill herself. 

“Momo” uses an image of a sculpture of a bug-eyed woman with black hair.

Police in Mexico say “Momo” started in a Facebook group.

“In social networks, the image of a terrifying woman is circulating,” add investigators, in a statement. “They call her ‘Momo’ and she invites those who see her to write to her through WhatsApp.”

“Momo” threatens to appear in the night or lay a curse on the users if they do not respond, according to Mexican police. Criminals can use the “game” to steal personal information or even incite users to commit suicide or violence, investigators add.

The creepy “Momo” image was taken from an Instagram account and then circulated on WhatsApp, according to police.