A report is now being compiled, to be sent to the Public Prosecution Service (PPS).

PSNI Detective Chief Inspector Ian Harrison said: “Police have concluded interviews with former military personnel and are in the process of compiling a report for the PPS.

“The families have been informed of this and we will continue to keep them updated in relation to developments.”

Eamonn McCann (pictured), the People Before Profit MLA for Foyle, said: “The news that all the former British soldiers associated with Bloody Sunday have now been interviewed under caution marks another milestone on the long march towards the truth.

“The interviews with the surviving soldiers were completed last month. The families shouldn’t have to hang on any longer.

“The PSNI had estimated that the current investigation would take four years. Four years have already passed.”