Police say the fire started in several places in the home. The mother, who owns the home, was gone for the night. Investigators believe the victims may be related.
High school students who believe the victims are their dear friends stopped at the scene throughout the day.
"She's really sweet and it's sad," said Amanda Baggett, who says she's a friend to one of the victims. "People were calling us and telling us and I didn't want to believe it until my mom told me."
"She was funny, really funny, always had us laughing in class," said Chad Promise, who also said he was friends with one of the victims. "A good personality and I just don't see how this could happen."
Police recovered what they describe as a lot of evidence and interviewed a dozen people.
"We are going to put our heads together collectively, we have some of the best and brightest on this case," said Lt. Eric Freed with the Baytown Police Department. "It's our job to comb over the facts and seek out the individual who did it."
Many parents spent the day having very tough conversations with their teenage kids
"She talked about what she wanted to do when she graduated and had high hopes and goals and it's just a shock," said parent Sandra Baggett.
And now, police are looking for leads in the case. If you can help, call Baytown Crime Stoppers. The number is 281-427-TIPS. You can remain anonymous.