Nigerian prosecutors have decided not to press charges against a 15-year-old girl detained after killing a man who had attempted to rape her.

Police said she stabbed the man, a friend of her father’s, in March when she had gone to his house to do chores.

But state prosecutors in the commercial capital, Lagos, say there is no evidence to support a murder charge.

At the time of her arrest, there was an outcry on social media by people saying she had acted in self-defence.

The teenager has been freed at a time of public protests over a wave of rapes and killing of women in Nigeria.

Thousands have recently signed a petition calling for an end to sexual violence.

Many Nigerians say the country’s legal system makes it hard to convict suspected rapists and blames women when they are victims of sexual assault.