A 60-year-old Kiambu man is in policy custody after allegedly raping his three mentally challenged daughters and impregnating one of them.

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The shocking incident happened in Wangige where the suspect repeatedly raped the three and a granddaughter in their single room house.

According to neighbours and the man's wife who is also mentally challenged, the suspect has been committing the heinous act and threatening the family against revealing his dirty secrets to the police.

The eldest daughter is six months pregnant.