The message below was distributed by both CSSC and the City of London

City of London Police Bulletin

The CoLP Action Fraud contact centre is continuing to receive reports and has received several reports in the last 24 hours from businesses who have been sent online extortion demands from scammers threatening a cyber attack.

The scammers who call themselves the “RepKiller Team” have been sending emails to businesses across the UK demanding payment of between £300-£500 in Bitcoins by a certain date and time.
If the demands are not met, the team have threatened to launch a cyber attack against the businesses and their reputation by automating hundreds of negative reviews online.
The emails also claim that once actions have started, they cannot be undone. Although these scammers are currently calling themselves “RepKiller”, it is common for fraudsters to continually change and adopt new tactics – email names can be made and changed easily.
This is effecting businesses across the UK, further details can be found here: http://www.actionfraud.police.uk/news/alert-businesses-across-the-uk-being-extorted-mar16.