A 45-year-old man was left with serious injuries after falling down the stairs at a construction site in Wied il-Għajn, police said.
The Qormi resident hit his head during the fall which took place at 9.30am on Triq l-Artillieri.
A medical team were called on site to assist and the man is currently at Mater Dei hospital.
Magistrate Dr Monica Vella is leading an inquiry into the case. A police investigation is ongoing.