Two $1 million rewards are being offered for information about the suspected murders of NSW teenagers Robyn Hickie and Amanda Robinson more than 40 years ago.
In April 2019, Lake Macquarie detectives established Strike Force Arapaima to re-examine the investigation into the unsolved disappearances and suspected murders of Robyn Hickie, Amanda Robinson and Gordana Kotevski.
Robyn Hickie was 18 when she left her home around 7.15pm on April 7, 1979, and was last seen standing at a bus stop on the Pacific Highway, Belmont North.
A fortnight later 14-year-old Amanda Robinson was last seen walking along Lake Road, Swansea, on April 21, after attending a dance at her high school in Gateshead.
Despite extensive investigations no trace of the girls has been found.
A coronial inquest into their disappearances found that the teenagers were dead, most likely as a result of foul play.
Police are renewing their appeal to the community to come forward with any information and will announce the $1 million rewards later on Monday.