SAN FRANCISCO, Feb 25 (Reuters) - Alphabet Inc's GOOGL.O
Google, Facebook Inc FB.O , Microsoft Corp MSFT.O and Twitter (N:TWTR)
Inc TWTR.N will all file or sign on to amicus briefs in
support of Apple Inc's AAPL.O fight against a magistrate's
order, which requires it to help the U.S. Federal Bureau of
Investigation break into a San Bernardino shooter's iPhone.
Sources familiar with the matter told Reuters that Google
and Facebook would make filings. Microsoft will file a friend-of
the-court brief as well, company President Brad Smith said in
Congressional testimony Thursday.
Twitter also will sign a brief in support of Apple, Twitter
said.