BBC: Some industrial software companies in the UK are "likely to have been compromised" by hackers, according to a document reportedly produced by British spy agency GCHQ.
'A copy of the document from the National Cyber Security Centre (NCSC) - part of GCHQ - was obtained by technology website Motherboard.
'A follow-up by the BBC indicated that the document was legitimate.
'There have been reports about similar cyber-attacks around the world lately.
'Modern, computer-based industrial control systems manage equipment in facilities such as power stations.
'And attacks attempting to compromise such systems had become more common recently, one security researcher said.'