Helicopter crashes into California building leaving several hospitalized

News Event - A helicopter crashed into a building in California, resulting in several hospitalizations [1] Source Information - The news is covered by NBC News [1] - NBC News provides breaking news, live video coverage, and original journalism [1] - NBC News has multiple online platforms including NBCNewscom, MSNBCcom, TODAYcom, Nightly News, Meet the Press, and Dateline [1]