Emergency services were called to Silk Mill Drive in Tinshill shortly before 3pm yesterday after reports of a blast.
Residents described hearing a loud bang as rubble was sent flying up to 100 yards from a first floor flat.
They were taken to hospital with injuries which were not believed to be life threatening.
Investigators from West Yorkshire Fire Service returned to the property this morning as work to establish the cause continued.
However, West Yorkshire Police has already said it is not being treated as a terrorism related incident.
A neighbouring property was evacuated yesterday due to structural damage and Silk Mill Drive remains closed while the demolition work continues.
First Bus is diverting its 6 and 19A services via Woodnook Drive in both directions.
It said: “Service 19A normal route towards Yeadon, diverted via the top end of Silk Mill Drive to Silk Mill Way towards Leeds and Garforth, not serving the stops around Tinshill Club.”