An anti-nuclear activist has accused former Costa Rican president and Nobel Peace Prize laureate Óscar Arias Sánchez of sexual assault. Alexandra Arce von Herold, a psychiatrist and nuclear disarmament advocate who frequently worked with Arias, said he approached her from behind, fondled her and forcefully digitally penetrated her while at his home in 2014. Arce filed a criminal complaint Monday against Arias.