Emergency services are at the scene of a road traffic collision on the Killylea Road.
The main road has been closed at its junction with Ballycrummy.
Four vehicles – including a Transit van pulling a trailer – have been involved in the incident, which happened shortly after 5pm.
Police and ambulance crews are on the scene.
Traffic travelling from Armagh is being turned back before the Ballycrummy junction, while traffic travelling into the city is being diverted along Ballycrummy.
There are no further details at this stage.