NORTH PORT, Fla. -- A 6-year-old girl found dead in the woods near her home was sexually assaulted and more than one person was involved in the attack, authorities said Friday.

Coralrose Fullwood's body was found in the woods two blocks from her family's North Port home on Sept. 17, hours after her parents reported her missing from her bed.

"The preliminary autopsy on Coralrose indicated no obvious signs of sexual battery," North Port police Chief Terry Lewis said. "Now, we have forensics evidence indicating a sexual battery did in fact occur."

Lewis would not elaborate on what type of DNA evidence was found or where it was discovered. Lewis said the second person either had direct knowledge of or participated in the assault.

No one has been arrested in Coralrose's slaying.

Coralrose's father, Dale Fullwood, was arrested in October on two counts of possession of child pornography unrelated to the slaying of his daughter. He pleaded not guilty and faces a July trial.