SAO PAULO, Brazil -- Police are investigating the alleged assault of an American woman visiting the Brazilian World Cup host city of Cuiaba, but a medical examiner's report said Saturday there were no indications that she was raped, as earlier feared.

A Cuiaba police department statement said a 24-year-old woman told them she was attacked Friday night after the Chile-Australia match.

She told police she was sleeping in the house of someone she met in a party held to celebrate Chile's victory when she awoke with a man on top of her. Her screams woke up her boyfriend who was sleeping nearby, and scared away the alleged assailant.

Police said the woman was treated at a local hospital and was in the care of representatives of the US Embassy.

The embassy said in a brief statement it was aware of the incident but because of the Privacy Act it could not share information about a US citizen without his or her written permission.