Sources: the FBI has declared a recent China-linked hack of a system, which contained pen register and trap and trace surveillance returns, a "major incident" (John Sakellariadis/Politico)

John Sakellariadis / Politico: Sources: the FBI has declared a recent China-linked hack of a system, which contained pen register and trap and trace surveillance returns, a “major incident” — The determination suggests the hackers successfully compromised swathes of sensitive data stored directly on FBI systems …