“The weapon that was used to injure the officers was a typical kitchen steak knife,” Mr Maddrey told a press conference on Saturday.
He said it is unknown at this stage if it was the same weapon used against the other victims.
Mr Maddrey said additional offers sent to the scene were not able to enter the home immediately because there was a fire inside the living room.
It is believed Gordon had been visiting the family at their home in the Far Rockaway neighbourhood.
“This scene was chaos. Multiple victims, a house on fire, and a mad man on a rampage, on a mission,” Patrick Hendry, the head of the New York Police Department’s police union, said.
“The skill that this police officer had shooting and stopping the threat after he was being stabbed. Unbelievable skill,” he said.