At least 10 people looked on and cheered while two De Anza baseball players had sex with a high school girl at a house party earlier this month, according to a TV interview of a De Anza softball player who attended the party.

Also Monday, the lead investigator in the case confirmed for the first time that the high school girl was sexually assaulted, and Santa Clara County sheriff’s officials said baseball players were among the partygoers who had been asked to give DNA samples.

The witness, De Anza softball player Megan Keefhaver, works part-time as an intern for NBC 11 (KNTV), which reported the story Monday. The interview marks the first public account of what happened two weekends ago at a baseball player’s birthday party in unincorporated San Jose. No one has been charged with a crime, but the investigation into the alleged rape has cast a pall over De Anza College and the baseball team, which returns to the field Tuesday for the first time since the incident.

Keefhaver said she stumbled on the incident in a room off the kitchen of a yellow house on South Buena Vista Avenue where about 50 people had gathered for the birthday party.

"The people in the room obviously were cheering the guys on or something like that," Keefhaver, who is dating a member of the baseball team, told NBC 11. "But I didn’t think of it as a rape situation."

Keefhaver said she didn’t know the girl was under 18. Although she did not immediately see the incident as an attack, she said, two members of the baseball team tried to stop the alleged assault but were not successful. Members of the De Anza women’s soccer team took the girl to the hospital, she said.