Detectives investigating the murder of 18 year-old Jonathan Cairns in 1999 have today arrested two women aged 72 and 46 in Derry.
Jonathan was from Ballykelly and his body was found in a shallow grave in Loughermore Forest outside the village on 25 April 1999.
He had been making his way home after a night out.
A man was jailed for helping to dispose of Jonathan's body, but no-one has ever been convicted of his murder.
In April last year, the teenager's parents made a fresh appeal for information on the 20th anniversary of his death.