Some of the emails had the subject line, "Think Twice." They were sent from a spoofed email address. The sender claimed to have had an associate plant a small bomb in the recipient's building and said the only way to stop him from setting it off was by making an online payment of $20,000 in bitcoin.
Not all of the emails had the same subject line
( z1 have :polarity - :ARG0 ( z2 email :mod ( z3 all ) ) :ARG1 ( z4 line :mod ( z5 subject ) :ARG1-of ( z6 same ) ) )