Paul McCormack retired from NYPD in 2010
An Irish man who served as a police officer in New York during the 9/11 attacks, says his memory of that day is still vivid.
Tomorrow marks 20 years since hijackers crashed planes into the World Trade Centre, the Pentagon and a field in rural Pennsylvania.
2,996 people were killed.
Paul McCormack, NYPD retiree, outlines one of his most stark memories from that day:

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