A truck has tipped over on the intersection of Queen Street and Lansdowne Road.
Traffic is being diverted from the lower Queen Street area and access to Lansdowne Road is being restricted.
The scene is being attended to by emergency services, including police and Nelson and Waimea fire brigades.
Do you know anything about the incident? Call us 24/7 on (03) 970 2925.
Nelson Live will keep you updated as information comes to hand.