A multi-agency operation is underway following a suspected burglary at a building suppliers on Bellbrook Industrial estate in Uckfield.
As of 10.00 30 July 2019, East Sussex Fire and Rescue Service, Sussex Police and South East Coast Ambulance are on scene.
Specialists have been called in after an unknown substance was found covering the area to check if it could be harmful. This is routine in these circumstances.
A small number of people are being looked after by the HART team from SECamb.