COLUMBUS, Ohio — A 17-year-old was raped by a man with whom she had been drinking and her 18-year-old female friend livestreamed the attack on the social media app Periscope, a prosecutor said Wednesday in announcing a rape and kidnapping indictment.

Authorities learned of the assault when an out-of-state friend of the accused woman saw the images, Franklin County prosecutor Ron O’Brien said.

Marina Lonina and Raymond Gates, 29, were charged with rape, kidnapping, sexual battery, and pandering sexual matter involving a minor. The rape charge involved intercourse by force and was not related to the 17-year-old’s age, O’Brien said.

Lonina and the victim were socializing with Gates on Feb. 27 when Gates raped the 17-year-old, O’Brien said. Lonina had also streamed pictures of the girl nude the night before at Lonina’s house, he said.

Lonina ‘‘categorically denies these charges,’’ said her attorney Josh Bedtelyon.

O’Brien said the motive for the livestreaming was unclear, but he said alcohol was a factor.

Associated Press