The Northern Ireland Director of Public Prosecutions was not involved in the police decision to launch a murder investigation into the Bloody Sunday killings, his office said.
Barra McGrory, QC, represented Martin McGuinness in the Saville Inquiry into the shootings in Londonderry in January 1972 when the Sinn Fein MP was an IRA leader in the city.
A report which confirmed the innocence of the 13 men shot dead by British Paratroopers also claimed that Mr McGuinness, now the deputy Northern Ireland First Minister, gave wrong information about his movements that day and was probably carrying a machine gun which he may have used to open fire on troops. A 14th victim died later.
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