A 32-year-old man on Tuesday admitted killing three people and attempting to murder three others in a spate of attacks in Nottingham, central England.
The attacks resulted in UK police locking down the entire city.
Valdo Calocane, also known as Adam Mendes, pleaded not guilty to murder but pleaded guilty to manslaughter due to diminished responsibility.
Two 19-year-old students at Nottingham University and a school caretaker aged 65 were stabbed to death in the early morning attacks on June 13.
Three pedestrians in the city centre were also injured after they were mown down by a van allegedly stolen from the caretaker.
Calocane's lawyer Peter Joyce said his client "does not dispute the physical facts of the prosecution's case".
But he told Nottingham Crown Court that he was suffering from "extreme" mental illness at the time.
The case was adjourned until January 16 next year, after the prosecution requested more time to decide if the pleas were acceptable.