Lance Armstrong admitted using banned substances, Oprah tells CBS

Disgraced cyclist Lance Armstrong told Oprah Winfrey in an interview that he used banned substances, she told CBS on Tuesday.

"We were mesmerized and riveted by some of his answers," Winfrey said.

Winfrey prepared 112 questions, and did not get to all of them.

Armstrong "did not come clean in the manner that I expected," Winfrey said, adding that he "was ready" and "met the moment."

The interview lasted two and a half hours and will air across two nights on her network, OWN, and will be streamed on her website, Oprah.com, she told CBS. The first part will air Thursday from 9 p.m. to 10:30 p.m. ET.