The United Revolutionary Front of Bhutan was a previously unknown group who claimed credit for a series of coordinated bombings in southwestern Bhutan on 20 January 2008. Nobody was killed in any of the bombings, though one woman was injured. The United Revolutionary Front of Bhutan claimed credit for the bombings in an email, and stated that they had formed in April 2007.
References
United Revolutionary Front of Bhutan Wikipedia(Text) CC BY-SA