Extortion via email. Contents below, including source IPs:

Good day. There is a bomb (Tetryl) in the building where your company is conducted. It was built according to my guide. It has small dimensions and it is hidden very carefully, it can not destroy the supporting building structure, but you will get many wounded people if it detonates.
My recruited person is watching the situation around the building. If any suspicious behavioror cop is noticed the bomb will be blown up.
I can withdraw my recruited person if you make a transfer. You pay me 20'000 usd in Bitcoin and the bomb will not detonate, but don't try to deceive me -I guarantee you that I have to call off my recruited person solely after 3 confirmations in blockchain.

My payment details (Bitcoin address): 1BHasGex1jhRZeY7KyUGGKUNRtVgKedRY8

You have to send bitcoins by the end of the workday. If the working day is over and people start leaving the building the bomb will explode.
Nothing personal, if I do not receive the money and an explosive device detonates, next time other companies will pay me more bitcoins, because this isnt a single incident.
I wont visit this email. I monitor my address every twenty five min and after seeing the money I will order my man to get away.

If an explosion occurred and the authorities read this email:
We are not the terrorist organization and do not assume responsibility for acts of terrorism in other places.

Source IPs:
194.58.39.67
194.58.39.10