‘Sounded like a bomb’: Mahogany residents stunned by townhouse explosion, fire [Video]

Investigators are working to piece together what caused an explosion and fire at a six-plex in the southeast Calgary community of Mahogany.

Multiple calls were made to 911 around 3:15 p.m. on Thursday.

Upon arrival to the area of 167 Mahogany Gardens S.E., crews discovered a row of eight connected townhouses on fire, with one of the homes destroyed.

The unit that collapsed was not occupied.

During the ordeal and the battle to contain it, four people were injured, including two civilians and two firefighters.

One of the civilians was taken to South Calgary Urgent Care in stable condition.

The other three people were assessed and treated at the scene.

Several residents in the area told CTV News they had smelled gas for the better part of the afternoon prior to the explosion.

“It sounded like a bomb. … We heard and we really felt it,” said Keri van Dongen, who lives across the street.

“So, I …