Four people, whose names have not been released pending notification of family members, died Christmas morning in a fire in the 300 block of East Salem Street, Blue Grass, Iowa.

Here's what happened, according to a Blue Grass Police Department news release:

Blue Grass and Buffalo firefighters, along with Scott County crews, responded about 12:34 a.m. to a fire in the ranch-style home in a residential neighborhood.

Four people were inside the home at the time the fire started. One of the occupants, who was able to exit the residence, was transported to the hospital but died later. Three other people in the home were unable to escape and died inside.

According to an Associated Press report, Blue Grass police Sgt. Garrett Jahns said Tuesday that the four people belonged to one family.

"We don't have a causation for the fire," said Blue Grass Mayor Tim Brandenburg, who was at the scene and did not want to speculate on what may have caused the blaze.

"Being from a small town, you deal with the tragedy maybe a little bit differently," he said, adding that the community will come together now. He added that crews fought the blaze in a "very bad element."

On his Facebook page early Monday, Brandenburg asked for thoughts and prayers for those fighting the fire and responding to the scene: "... many are young firefighters seeing this tragedy first hand for the first time."

Investigators searched Monday for clues about the cause of the fire. Crews removed debris from the charred wreckage of the house, which sits next to a garage with a basketball hoop. Outside the home were some children's toys, including a little yellow car and a wheeled vehicle for a small child.

This is the second fire-related tragedy in Scott County within a week's time. Kelsey Clain, 23, and Jayden Smead, 5, and Carson Smead, 2, died this past Thursday after a fire at the Five Seasons mobile home park, 5100 Fairmount St. Two other children remain hospitalized at University Hospitals, Iowa City.

No working smoke detectors were present in the Davenport home, according to investigators. The cause of the fire remains under investigation.