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.
Eventually, the person who sent the emails was discovered and arrested. 
( z1 and :op ( z2 discover :ARG1 ( z3 person :ARG0-of ( z4 send :ARG1 ( z5 email ) ) ) ) :op ( z6 arrest :ARG1 z3 ) :time ( z7 eventual ) )