A 19 year old man from a settlement in Navua is under police investigation after he allegedly raped his 14 year old sister 25 times over a period of time.

The matter was only reported to police last Friday when the younger brother found out about the incident.

Navua police confirm that the young girl is now under the protection of the Social Welfare Department and the 19 year old brother has been told to go and stay with his uncle in Nausori.

The 19 year old man is alleged to have threatened his younger sister that he will kill her if she reported the rape to the police.

Their father has passed away and the three were staying with their mother in Navua.

Police said the file has been forwarded to the Director of Prosecutions for charges to be laid.