The U.S. Olympic and Paralympic Committee is suing its insurance carriers in an effort to reach a settlement with Larry Nassar survivors, its chair said Friday.

Despite being in mediation for almost a year and a half, the USOPC and USA Gymnastics have been unable to come to an agreement with the survivors. USOPC board chair Susanne Lyons placed the blame on the organization’s insurance carriers, saying they have “not lived up to their contractual obligations.”

“This lawsuit seeks to have a court resolve the issues related to the insurers’ obligations, as part of our efforts to achieve a fair resolution for the victims and survivors,” Lyons said.

“We feel additional work needs to be done to get to a place of settlement,” she added.

Attempts by USA TODAY Sports to obtain a copy of the lawsuit, filed in Colorado state court in Denver on Thursday, were not immediately