Three held after 'substance' found in Hull 5 January 2014 Last updated at 16:41 Three people have been arrested after an "unknown substance" was found at a house in Hull. Properties on Kilnsea Grove, in the east of the city, have been evacuated and the Explosives Ordnance Disposal Unit are at the scene. Humberside Police said it was called by a member of the public in the early hours. A 15-year-old boy, 49-year-old woman and a 56-year-old man are being held in police custody. People have been urged to stay away from the area. Det Insp Jason Gourley said: "We have arrested three people who are currently assisting us with our enquiries in connection with substances believed to be at a property on Kilnsea Grove. We hope that residents can return to their properties as quickly as possible, but public safety is paramount, so we hope that everyone will obey the police cordons.