Officers are concerned for the safety of two teenagers after they were reported missing together from the Southwell area.
Samuel Lloyd and Charlotte Brown, both 16, were reported missing from the area on Friday, July 27.
Samuel is white and is described as slim build, 6ft tall, with blonde hair which is shaved at the side and scruffy on top.
He was last seen wearing dark blue jeans, a white Northface t-shirt, white Adidas trainers and carrying a black rucksack.
Charlotte is white and is described as having long dark straight hair and was last seen wearing black trousers, a black top and carrying a big black bag.
If you have seen Samuel or Charlotte or know where they might be, please call 101, quoting either incident number 1184 or 1231 of 27 July 2018.
You can also call Crimestoppers anonymously on 0800 555 111.