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.
The subject line of some emails were the same
( z1 same :ARG1 ( z2 line :mod ( z3 subject ) :part-of ( z4 email :quant ( z5 some ) ) ) )