DURHAM, N.C. — Durham police still have a lot of questions about a Monday house fire. The problem is the only witness is not talking and that has put the investigation on hold.

On Monday, fire ripped through the Trimble family home, burning it to the ground. More than 72 hours later, police are still not quite sure what kind of case they have on their hands. Police say 17-year-old Brooke Trimble was the only witness.

"It's a little frustrating," said Lt. N.J. Blake, of the Durham Police Department. "There are some questions that need to be answered and she's the only one who can provide us with the answers."

On Monday, police said Trimble was too upset to talk to them. Since that time, police said her family has been inaccessible.

The only person Trimble talked to was a sheriff's deputy who happened upon the scene. Trimble told him that three men broke into her house, tied her up with a chain and duct tape. After they left, she escaped, but police have not been able to confirm anything.

Police said they need Trimble's help to figure out whoever is responsible for setting the fire.

"To help us determine whether or not there are some suspects involved and if there is to get descriptions out to the public," Blake said.

Trimble's parents told police they may bring her in next week for questioning. Police have said they do not think this was a random act, but they are not saying much beyond that.