Nottinghamshire Police are attempting to track down a number of offenders following a three-day spate of robberies in Bestwood and Top Valley.
Four separate incidents occurred over the weekend, starting on Friday 15 May.
The first took place outside the Co-op supermarket in Beckhampton Road, Bestwood at around 11pm on Friday (incident 1009).
Three people were stopped by a group of ten males and females who then proceeded to threaten and assault them.
The victims’ mobile phones and a backpack was stolen, with one victim also sustaining cuts to the face with what is thought to be a knife.
Two main offenders in the incident were both white males believed to be in their late teens.
One had dark hair, was stockily built and wore a blue top, while the other was around 6ft tall, with a skinny build and wore a black padded jacket.
CCTV footage of a group of six males and females seen at this location at around the time of the offence has been issued by police as part of the investigation.
A similar incident took place the next day in Old Farm road, Top Valley, at about 6.30pm – where two men were threatened with knives and had their phones stolen by two offenders (incident 734).
Both offenders were white, in their late teens and around 5ft 10ins tall.
One was slim, wore a black hoodie and a balaclava, and the other had short blonde hair.
Later that day in Ridgeway, at around 10.30pm, two more victims had their wallets and phones stolen by two white male offenders who threatened them with knives (incident 938).
One was around 6ft, slim, with short blond hair and wearing dark clothing. The other was around 5ft 10ins, also slim and also wearing dark clothing.
A smartly dressed female was also seen with the two male offenders.
The fourth robbery occurred in Ridgeway at 4am on the Sunday, where a mobile phone and earring was stolen (incident 497).
Both offenders were female and described as white, slim and in their early 20s.
One was around 5ft 4ins tall with shoulder length blonde hair that had a yellow tinge. She was wearing a green parka-style jacket, blue jeans and black shoes.
The other was slightly taller with mousey brown hair in a long ponytail. She was wearing black jeans and a hooded coat.
Nottinghamshire Police urge anyone with information to call them on 101, quoting the incident number stated.