JEFFERSON COUNTY, Mo. – A three-year-old boy died in a house fire Tuesday morning in Jefferson County.

Investigators say Kaiden Strubberg died in the fire. The first-alarm fire broke out at a home in the 3100 block of Diamond Drive in High Ridge. It started around 7:45 a.m.

When fire crews arrived at the scene, an older sibling of the 3-year-old and their mother were outside the home. They were both taken to the hospital to be treated for smoke inhalation.

“When we arrived on scene, our first truck arrived, and there were neighbors with a garden hose and a fire extinguisher trying to put out the fire in the front of the home, which is where we believe the child was,” High Ridge Fire Protection District Chief John Barton said. “There was heavy fire coming out of the front door and windows. There were a lot of neighbors doing what they could to try to assist, but unfortunately, the fire spread too rapidly.”

“Our hearts go out this morning to a High Ridge family who lost a child and their home to a fire. No words can fill the void left by this tragedy. We’re also thinking of our friends at High Ridge Fire Protection District who responded to the call. This is a tough day for them, too. Dealing with death is part of the job for all first responders. But it’s never easy when the victim is a child. Our Detectives are investigating along with the State Fire Marshal’s Office. The cause of the fire hasn’t been determined at this time,” writes the Jefferson County Sheriff’s Office on Facebook.

It is unknown at this time how the fire started. The Jefferson County Sheriff’s Office credits passersby for attempting to extinguish the fire before crews arrived.

FOX 2 will continue to update this story with more information as it becomes available.