A man was critically injured on Thursday morning when he fell a height of about one storey while he was working in a reservoir, the police said.
The accident took place in Madonna tal-Hniena Street, Xewkija, at 9.30am.
The man, aged 68, of Xewkija, was taken to Gozo General Hospital with serious injuries.
Magistrate Brigitte Sultana is leading an inquiry.