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 sender was never apprehended. 
( z1 apprehend :polarity - :ARG1 ( z2 person :ARG0-of ( z3 send ) ) :time ( z4 ever ) )