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.
Many of the people that were contacted fell for the emails. 
( z1 fall :ARG1 ( z2 person :quant ( z3 many ) :ARG1-of ( z4 include :ARG2 ( z5 person :ARG1-of ( z6 contact ) ) ) ) :ARG2 ( z7 email ) )