A pedestrian has been knocked down by a truck outside Phibsboro Shopping Centre.
The crash happened just after two this afternoon.
The injured man has been taken to the Mater Hospital, where he is understood to be in a serious condition.
Emergency services are at the scene, and drivers are being told to avoid the area.
Gardai say Connaught Street to Cabra Road is now closed, and is advising drivers to use alternative routes.