JACKSONVILLE, Fla. -- Chuck E. Cheese's Restaurants across the nation began pulling a popular toy off its shelves Tuesdays after local fire officials started looking into the toy as part of its investigation into what caused a fire that killed two children on Jacksonville's Westside.

About 6 a.m. Monday morning, a mother found that a small fire in the bedroom where her 5-year-old daughter Alyssa Bullock and 7-year-old son Robert Bullock sleep had apparently burned itself out. She carried the children outside, but they could not be revived.

The toy being looked at is called a disco ball, and until Tuesday morning, for 1,500 tickets at Chuck E. Cheese's, anyone could own one.

Channel 4 was told that a disco ball toy was left on and placed on top of a plastic slide when it may have caught fire, causing the children's bedroom to become filled with acrid smoke.

Chuck E. Cheese's officials said they have voluntarily pulled the disco balls off their shelves nationwide because of what happened on Monday.

Although the fire department has not officially said the disco balls caused the fire, Chuck E Cheese's said they are conducting an internal investigation.

In statement released by Chuck E. Cheese's representative Richard Hudson stated, "We were deeply saddened over the death of the two children in Jacksonville. Our thoughts and prayers go out to the family. We are not sure what happened, but have launched a full internal investigation."

The children's father said he knew his children owned one of the disco balls. He said his daughter got one of the toys for her fifth birthday from the Chuck E. Cheese's located on Youngerman Circle.

Chuck E. Cheese's said it has contacted the Consumer Product Safety Commission about whether there should be a recall of the toy. The restaurants have been distributing the disco ball since 2002, but said it never had any problems.

The disco balls were not only available at Chuck E. Cheese's, but are also on sale at other local stores.

Channel 4's Emily Pantelides reported that a warning label printed on the disco balls tells users not to leave the toy on for longer than four hours.

The CPSC told Channel 4 it was, "Very interested in learning the cause of the fire to see if a federal investigation is warranted."

In the past, the commission has ordered a recall of three items distributed by Chuck E Cheese's, including two that posed a choking hazard and one that posed a fire hazard.