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Book claims 'indisputable evidence of security forces collusion'

24 October 2013 Last updated at 18:50 BST

A new book claims members of the RUC and UDR were part of a loyalist gang that killed more than 100 people in the 1970s.

The book claims to have uncovered evidence of collusion on a huge scale.

BBC NI home affairs correspondent Vincent Kearney reports.