Another CW showrunner has been hit with sexual harassment allegations following those made against "Supergirl" creator Andrew Kreisberg. This time it's "One Tree Hill" creator Mark Schwahn, who now stands accused by 18 female cast and crew members of sexual harassment while he led the hit series from 2003 to 2012.

The accusations started against Schwahn over the weekend when writer Audrey Wauchope reported on her Twitter feed various incidents of sexual harassment she witnessed during her tenure on the series:

By Monday, 18 former cast and crew members had confirmed Wauchope's allegations against Schwann in a letter published for Variety:

Many of us were, to varying degrees, manipulated psychologically and emotionally. More than one of us is still in treatment for post-traumatic stress. Many of us were put in uncomfortable positions and had to swiftly learn to fight back, sometimes physically, because it was made clear to us that the supervisors in the room were not the protectors they were supposed to be. Many of us were spoken to in ways that ran the spectrum from deeply upsetting, to traumatizing, to downright illegal. And a few of us were put in positions where we felt physically unsafe. More than one woman on our show had her career trajectory threatened.

All of the show's female cast members signed the letter, including: Sophia Bush, Hilarie Burton, Bethany Joy Lenz, Danneel Harris, Michaela McManus, Kate Voegele, Daphne Zuniga, India DeBeaufort, Bevin Prince, Jana Kramer, Shantel Van Santen and Allison Munn. Crew members who signed included Wauchope, Rachel Specter, Jane Beck, Tarin Squillante, Cristy Koebley and JoJo Stephens.

“I am so proud to call these women my family,” Bush wrote in a message posted to her Instagram account. “You cannot imagine.”

More female crew members of “One Tree Hill” have since tweeted messages of support asking their names be added:

E!, the network currently airing Schwann's show "The Royals," has since said it was “monitoring the information carefully" and has made no decision on the matter.