A cyclist has been critically injured in a collision in the Phoenix Park in Dublin.

The man in his 50s was in a cycling lane on Chesterfield Ave - between Aras an Uachtaráin and Castleknock Gate - when he collided with a pedestrian shortly after 8.30 last night.

The cyclist is critical in Beaumont Hospital, and the pedestrian - a man in his 30s - receieved leg and back injuries.

Gardai are appealing for witnesses.