"The dangers of misinformation and its promulgation has now led to deadly consequences," she wrote. "I will work to restore trust in public health to those who have lost it -- through science, evidence and clarity of purpose.

The suspected gunman who attacked the Centers for Disease Control and Prevention's campus on Friday may have fired many hundred rounds, law enforcement said on Tuesday.

Kennedy has been a leading voice in spreading false information about vaccines, scientists and public health leaders, often using heated rhetoric that says they have caused mass death and injury. People he describes in such language have said his comments have led to threats, intimidation and even violence.