A woman, her infant son and sister-in-law lost their lives when the roof of an old house collapsed during construction work.

A Rescue 1122 spokesman said here on Tuesday that the fatal incident occurred in Chak 381-GB Bara Olakh where a family was constructing a room on the roof of a house when the structure suddenly gave way.

After receiving an emergency call, rescue teams rushed to the spot.

Initial investigations revealed that construction of a new room was under way atop the old and building when a wall collapsed, causing collapse of the roof structure. The roof crashed into the room below.

As a result, three family members were buried beneath the rubble and died on the spot.

One-year-old Ali Hassan, 22-year-old Saadia Bibi and 22-year-old Rehana, the child’s paternal aunt, died in the incident.

Rescue teams retrieved the bodies from the debris and secured the area while conducting an assessment of the damaged structure.

Area police also reached at the site to monitor the situation and gather information regarding the incident.

Officials said preliminary findings suggest structural failure of the old building during construction, while a detailed investigation was under way to confirm the cause.