It happened around 5 a.m. at a home on Deepwood Lane in Norwalk.
Firefighters arrived to find heavy smoke and fire coming from the basement and garage area. All the windows and doors were blown off the house.
The two occupants, married and expecting couple Bertrand and Mamata Simon, were sleeping upstairs at the time. They were able to escape from the home with no injuries.
Pregnant woman, husband escape gas explosion and fire at their home in Norwalk this morning. pic.twitter.com/h3iWbV0acY— Marcus Solis (@MarcusSolis7) June 12, 2018
"We didn't know if it was an earthquake or a bomb, we had no idea what it was," said Mamata Simon.
What she and her husband did know, was to get out of their house as quickly as possible. After the explosion, the couple smelled smoke.
"I came outside and noticed that it was just our house, so that's when I realized it was a fire at our place and not something else that had happened in the neighborhood," said Mamata.
"Multiple windows were blown from the house, doors were blown open, garage doors were blown open," said Norwalk Deputy Fire Chief Albert Bassett.
Three engines and two trucks responded, and the fire was brought under control in about 30 minutes. The house runs on propane gas. Utility workers vented the gas away from the home as the investigation continued.
The house was deemed unfit for occupancy.
The cause of the fire is under investigation.
* More Connecticut news
* Send us a news tip
* Download the abc7NY app for breaking news alerts