Police, contacted on Thursday, confirmed that there is an investigation but would not describe or categorize the exact nature of what they are looking into.
No arrests have been made, and no charges have been filed.
According to an incident report filed with Miami police on Friday, an unnamed woman said she had an encounter with Kaepernick, 49ers wide receiver Quinton Patton and Seattle Seahawks receiver Ricardo Lockette on April 1 at the Viceroy in downtown Miami. The woman told police she spent time with the three players, drinking and smoking marijuana in Lockette's apartment and eventually ending up in a bedroom with Kaepernick.
According to the report, the woman told police she and Kaepernick undressed but did not have sex, and that Kaepernick eventually left the room. The woman also told police, according to the report, that Patton and Lockette later opened the door and "peeked" into the room but closed it and left after the woman told them to get out. She told police she could not remember anything after that.
TMZ.com reported earlier Thursday that Kaepernick is being investigated for an alleged sexual assault, citing law enforcement sources.
Miami Police Department public information officer Rene Pimentel later told the Mercury News that the website "took the report out of context."
In a statement released by the 49ers on Thursday, general manager Trent Baalke said the team was aware of the report and "is in the process of gathering the pertinent facts."
The Seahawks also released a statement Thursday, saying the team was aware of the situation and "is monitoring it closely and will not have any further comment at this time."