Heuermann's arrest is connected to the investigation of the "Gilgo Four," which refers to four women who were found wrapped in burlap within a few days of each other in late 2010.
The Oklahoma Court of Criminal Appeals approved the convicted murderer's appeal after it was revealed that Judge Timothy Henderson was in an undisclosed sexual relationship with one of the prosecutors in the case.
Channel News Asia reported that Singapore-based Malaysian tycoon Ong was asked by CPIB to provide information in relation to his interactions with Iswaran.
Though Acropolis will remain closed during the peak day time as there is little tree cover on the hill, some other tourist attractions on the Sacred Rock will remain open throughout the day.