United States

www.nbcnews.com Note left by gunman who killed officer says he was hit by "sonic waves"

Police say Kevin Douglas Limbaugh, 48, opened fire on Davis police Officer Natalie Corona, 22, without warning as she responded to a traffic collision.

Read also:

www.cnn.com Suspect in California officer's killing left note accusing police department of hitting him with 'ultra sonic waves'www.cnn.com