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Timeline of phone-taping controversies

Nov 11, 2013: Garda Commissioner Martin Callinan (inset) contacts the Attorney General's office over the issue of recorded phone calls and says he expects to call in the Data Protection Commissioner. Attorney General Marie Whelan is aware of the existence of tapes of recorded calls.

November 25: Ian Bailey and his partner Jules Thomas, who are separately suing the Commissioner and State for wrongful arrest in the Sophie Toscan du Plantier murder investigation, are told "unexpected electronic material" has been found in a trawl of garda case files. The High Court gives gardai until yesterday to unscramble the data – believed to be recorded phone calls.

Nov 27: Mr Callinan orders that routine recording of non-999 calls to garda stations stop.

Feb 28, 2014: Department of Justice officials are told by the garda and the Chief State Solicitor's office about the recording of phone calls.

March 10: Mr Callinan writes to the Department of Justice revealing that the garda has been involved in widespread recording of phone calls in and out of stations. He said he notified the AG's office.

March 11: Commissioner Callinan holds talks with officials in the Department of Justice and the AG's office on taped phone calls related to a civil case.

March 19 and 20: Garda headquarters sends copies of letters between it and the AG's office and the Data Protection Commissioner on the controversial taping of phone calls to the Department of Justice.

March 23: Taoiseach Enda Kenny learns from the AG of the issue.

March 24: Alan Shatter learns of the issue and meets the Taoiseach and the AG. Meanwhile, Brian Purcell, Secretary General of the Department of Justice, meets with Mr Callinan.

March 25: Mr Callinan announces to colleagues in Garda HQ that he is standing down while the cabinet are informed of the crisis. Mr Shatter receives the letter sent to him on March 10.

March 26: Mr Shatter refuses to resign but offers apology to whistleblowers whose concerns preceded the taped phone calls crisis.