FILE PHOTO: The logo of Bayer AG is pictured outside a plant of the German pharmaceutical and chemical maker in Wuppertal, Germany August 9, 2019. REUTERS/Wolfgang Rattay/File Photo

BERLIN (Reuters) - Mediation between Bayer and plaintiffs in the United States aims to clarify all justified claims related to Roundup herbicide both at the national and state level, mediator Ken Feinberg told a German magazine.

“The mediation is going slowly but steadily,” Wirtschaftswoche on Wednesday quoted Feinberg as saying.

Bayer is trying to reach a settlement after earlier court rulings against it. The German drugs and pesticides maker, which acquired Roundup and other glyphosate-based weed killers as part of its $63 billion takeover of Monsanto last year, faces potentially heavy litigation costs as plaintiffs claim Roundup causes cancer, something Bayer disputes.