Police in the North are expected to ask a judge for permission to question Gerry Adams for longer.
The Sinn Fein leader is being questioned in connection with the murder of a mother-of-ten.
Jean McConville was killed in 1972, but Gerry Adams has always denied any involvement.
Jean's daughter has told police she's no longer afraid, and is "ready to name names".
The Sinn Féin Party believe the timing of the arrest is politically motivated.
