No charges will be filed and no arrests made after the investigation into an alleged sexual assault at the home of three Nebraska football players, Lincoln Police Chief Jim Peschong and Lancaster County Attorney Joe Kelly said in a news conference Wednesday.

A 20-year-old woman reported that she was assaulted on Nov. 15 at the home of Nebraska quarterback Tommy Armstrong Jr., receiver Jordan Westerkamp and tight end Trey Foster.

No suspects were named. Police interviewed the Nebraska players and three others at the home at the time of the alleged incident. The investigation concluded Tuesday, according to the police chief.

"With the investigators and with the Lancaster County Attorney's Office," Peschong said, "we do not feel that we have the elements of a crime that we can go forward with."

Nebraska quarterback Tommy Armstrong Jr. has been practicing during the police investigation. Steven Branscombe/USA TODAY Sports

Kelly said he would required "proof beyond a reasonable doubt that a crime had occurred" in order to file charges.

"The decision is simply an evaluation that we make when we compare the facts as we know them with the elements that we would have to prove in front of a jury beyond a reasonable doubt," Kelly said. "That simply is not there. Ethically, I cannot move forward."

Coach Mike Riley said Monday that his team was preparing normally to face third-ranked Iowa on Friday despite the investigations. All three players have been practicing.

The university, which is also investigating Armstrong, Westerkamp and Foster, issued a statement Wednesday after it was announced no charges would be filed.

"We are aware of this morning's announcement by the Lincoln Police Department and the Lancaster County Attorney. There is no change in the status of any student-athletes. We will continue to follow University policies," it said.

The Associated Press contributed to this report.