A devastating fire that killed five people, three of them children, has rocked a Louisville neighborhood.  Speculation is growing on what caused it.

There is no official cause yet, but family members have their own ideas.  Flowers, stuffed animals, bright ribbons, bows, and a football sit in front of a newly erected cross in front of the home on South Clay Street.

"I need answers, I have questions, what happened how it started, somebody said it was fireworks or something.  I don't know," said William Jackson, whose daughter was killed.

Jackson lost his 21-year-old daughter Gabrial Johnson.  Her car is where she left it the last time she drove it, just a few yards from the home.

Five people are now dead, Johnson, a three-year-old, a five-year-old, a ten-month-old, and a man yet to be identified.  "There was a baby, and the two babies I feel sorry for them and Anthony, he's my best friend," said Makalya Duncan, played with children.

"Sometimes people go bad in fires, sometimes they make it, but the two little ones didn't make it," said Quan Russell, Jr., a friend..

"Our records show that on June 5, of last year 2008, the first unit that arrived at that scene is the same one that installed a ten-year lithium battery, tamper-proof smoke detector," said Sgt. Sal Melendez, Louisville Fire Department.

That smoke detector was nowhere to be found on the main floor.  Firemen say it could have made all the difference.

While evidence must be analyzed in Frankfort, Kentucky to help determine a cause, some in the neighborhood are saying fireworks and others say they believe it was intentionally set.  William Jackson only knows he has to bury a daughter.  "How do you cope with this?  Man, I don't know, we haven't even got to that point yet, we just went and dealt with the funeral arrangements today, trying to get everything situated and straightened out," said Jackson.

Nine people were in the house when the fire broke out, two other children remain hospitalized, one in critical condition and the other fair.