Sender sent the following e-mail from Hannah@ashishdas.com:

I write you to inform you that my recruited person has carried the bomb (Hexogen) into the building where your business is located. My man assembled the bomb according to my guide. It can be hidden anywhere because of its small size, it can not destroy the supporting building structure, but you will get many wounded people if it explodes.
My mercenary keeps the area under the control. If he sees any unusual behavior or emergency the bomb will be exploded.
I can call off my mercenary if you pay. You send me 20'000 usd in Bitcoin and the device will not explode, but don't try to cheat -I warrant you that I have to withdraw my mercenary solely after 3 confirmations in blockchain.

It is my BTC address : 1P3cNFy3SdfZ8PvMSdgLRcb2TtaLvxfqat

You have to solve problems with the transaction by the end of the working day, if you are late with the money the device will explode.
This is just a business, if you don t send me the bitcoin and the bomb detonates, other companies will transfer me more money, because it isnt a single incident.
To stay anonimous I will not log into this email account. I monitor my Bitcoin address every twenty min and if I receive the transaction I will order my person to leave your area.

If a bomb explodes and the authorities read this email- We are not terrorists and dont take liability for explosions in other buildings.