West Sussex Fire and Rescue Service said it was receiving a ‘high volume of 999 calls’, regarding a ‘large field fire’ at Upper Kingston Lane in Southwick, around 2.45pm. The fire service said two fire engines and three off-road vehicles were at the scene, adding: “Thank you to everyone who has called to make us aware, we appreciate your vigilance.” Upon arrival, crews were met with a grassland fire involving one acre of land. Beaters, hose reels and a thermal imaging camera were used to extinguish the blaze, the fire service said. As of 4pm, crews from Shoreham-by-Sea, Haywards Heath and East Sussex remained at the scene damping down. In an update on Thursday morning, the fire service said the cause of the fire ‘remains unknown’. Have you read?: Sussex heatwave: how long will it last, how much hotter will it get and when will it end? Tinderbox Sussex: County in top 40 most fire-prone regions in UK Large fire in Walberton: West Sussex Fire & Rescue Service tackling ‘fire involving 15 acres of grassland’ For the latest breaking news where you live in Sussex, follow us on Twitter and like us on Facebook.