Police statement on the incidentpublished at 09:52 BST 9 May
Det Ch Insp Ruby Burrow, of Nottinghamshire Police, said there was no indication currently that there was an "ongoing threat to the wider public".
She added: "We understand the incident will cause concern in the community.
“Officers will remain at the scene today to carry out further inquiries, speak to local people and offer reassurance.
“It is also important anyone with information, or relevant dashcam, CCTV, doorbell or mobile phone footage, gets in touch without delay.”