MYSTERY SURROUNDS WHO is responsible for a series of vandalism attacks on power plants in the US – the latest of which happened this weekend at four locations in the western US State of Washington. Police gave no information on who they suspected was behind the vandalism, which knocked out power on Christmas Day for some 14,000 in Tacoma, a port city area south of Seattle. Tacoma Public Utilities, which owned two of the facilities targeted on Sunday, said in a statement that it was alerted by federal law enforcement in early December about threats to their grid. The Pierce...