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 emails threatened to blow up a building
( z1 threaten :ARG0 ( z2 email ) :ARG1 ( z3 blow-up :ARG1 ( z4 building ) ) )