It happened around 9:40 p.m. at a home on Heywood Lane in Sicklerville.
Police say when they arrived they found a 26-year-old woman and a 24-year-old man suffering from stab wounds. The victims, who are siblings, were transported to an area hospital for treatment.
Police identified the suspect as 23-year-old Dominic Fagnani.
He is facing charges of attempted murder, aggravated assault and possession of a weapon for an unlawful purpose.
Fagnani is currently being held at the Camden County Correctional Facility pending a pretrial detention hearing.