At least 21 teenagers were found dead early Sunday morning at a nightclub under mysterious circumstances in South African city of East London. The cause of this tragedy still remains unclear.

Nine of the deceased were female, and 12 were boys. Victims affected at the party were young people aged between 13 and 20. Most of the affectees were students who were celebrating a party after exams.

The South African Police Service has launched an investigation into the incident. According to the police, none of the dead bodies possesses any bruises or injury marks.

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The youngest of those who died was 13, according to the Police Minister. However, a detailed list of the victims has not yet been produced.

The minimum drinking age in South Africa is 18, so teenagers should not have been allowed in the night club.