A 14-year-old student apparently committed suicide at her Howrah home and scribbled six digits on her wrist with lipstick that appeared to be the passcode of her smartphone, police said.

The family of the girl, found hanging on Sunday night, alleged that she was forced to commit suicide after a man who befriended her on social media was allegedly using some of her photographs to blackmail her.

The deceased was a Class VIII student, who had also participated in state and national-level karate championships. “My sister had told me about a friend who was disturbing. I can’t never imagine that the matter aggravated so much” said the girl’s elder sister.

The family lodged a complaint with Bally police station but failed to give the details of the accused.

A friend of the girl said she had never shared her mobile phone’s passcode with anyone. “It is significant that she wrote the digits on her wrist before ending her life.”

Anupam Singh, the deputy commissioner (North), Howrah, said, “The girl’s phone (which has been seized) will be sent for forensic test.”

Officers of Bally police station said they would examine the family members and the friends she had met through social media to get to the bottom of the allegations made by the family.

Police have started a case under section of abetment to suicide against unknown person.