'The only ethical thing I felt I could do is to tell the truth,' the unidentified woman said.
For 25 minutes, Texas deputies and police officers alternated between trading shots and negotiating with the Santa Fe High School gunman.
Mark Zuckerberg is expected to offer an apology in a meeting that will be live-streamed
Vaccine use starts new era of fighting deadly virus
Strong support for vaccines has fallen since 2008, survey finds