Flames destroy a mansion owned by former tennis star James Blake today in a gated community in Tampa, Fla.

ST. PETERSBURG, Fla. - Police in Florida say the fire at the home of a former tennis star was intentionally set and a family of four was killed.

Hillsborough County Sheriff's Col. Donna Lusczynski said Wednesday that two adults and two teenagers were killed in the mansion belonging to tennis player James Blake. He was not home at the time and was renting the house to the family.

Lusczynski said the scene was "unusual." She says officials don't know how the fire was set.

She added that there were "various fireworks" throughout the home and that two of the bodies appeared to have "upper body trauma," but she didn't give any more details.

Authorities say the bodies in the home have not been positively identified.

The home was in an upscale subdivision north of Tampa. Many sports stars and executives live in the neighborhood.