DUBLIN, Ireland - Investigators are continuing to probe the circumstances that led to the death of a Garda officer on Sunday.

Another person, a man aged in his 30s, was seriously injured in the tragic incident which took place around 1:00pm on Sunday afternoon.

"I am deeply saddened by the death of my colleague Garda Kevin Flatley," Garda Commissioner Drew Harris said in a statement released late Sunday. "My thoughts, and the thoughts of all personnel in An Garda Siochana, are with Kevin's family and friends. We also think of Kevin's colleagues at the Roads Policing Unit, Dublin Castle."

"Kevin, 49 years of age, has over 26 years of dedicated service to An Garda Síochana and the people of Ireland," Commissioner Harris said.

"Garda Kevin Flatley is the 90th member of An Garda Siochana killed in the performance of duty."

"Kevin was on duty this afternoon, serving the public by endeavouring in keeping them safe on our roads," Harris said.

"His death is a terrible reminder of the dangers faced by Gardai." 

"Ar dheis Dé go raibh a anam uasal."

Taoiseach Micheal Martin summed up the feelings of people across Ireland with a statement.

"Our gardai serve with courage and dedication each and every day to keep the public safe and to prevent crime," he said.

"The loss of a garda while on duty will be keenly felt by those who knew him, in communities across Ireland and by all members of An Garda Siochana."

Ireland's President Michael D Higgins added his tribute to Kevin and his family, with a statement on Sunday.  "As President of Ireland, may I express my deepest condolences to the family, colleagues and friends of Garda Kevin Flatley, who today lost his life while serving the community," he said.

"Garda Flatley dedicated his career to public service and to keeping people safe. The loss of a Garda has a deep impact on society due to this strong connection and my thoughts are with his family and all those who knew and cared for Garda Flatley across his life.

The tragedy began to unfold when Gardai and emergency services responders were called to a collision on the R132 at Lissenhall near Swords. There they found a motorcycle had collided with the Garda officer based at Dublin Castle. Garda Flatley, was killed in the incident and was pronounced dead at the scene.

The motorcyclist, a man in his 30s, was treated at the scene before being taken by ambulance to Beaumont Hospital in serious condition.

The body of the fallen Garda officer was removed to the Dublin City Mortuary where a post-mortem examination will be carried out by the State Pathologist.

The scene of the collision has been examined by Garda Forensic Collision Investigators and the R132 has since reopened to traffic.

Investigators are renewing their appeal for witnesses to come forward.

Road users who may have camera footage, including dashcam recordings and were in the area at the time are urged to share this material with Gardai.

Investigators are particularly interested in tracking the movements of a Yamaha R1 motorcycle in the vicinity between 12 noon and the time of the collision.

Anyone with information is asked to contact Swords Garda Station at 01 666 4700, the Garda Confidential Line at 1800 666 111 or any Garda station.