Traffic diversions were put in place following a serious road incident on the junction of Drumcondra Road and Griffith Avenue in north Dublin this morning.
A collision involving a motorcyclist and vehicle occurred at about 6.45am, blocking the road in all directions for a time.
Gardaí have asked motorists to avoid the area and use alternative routes.
They are appealing for witnesses to contact them in Santry on 01 6664000, the Garda Confidential Line on 1800 666 111 or any Garda station.