Twenty-eight people, including a 15-year-old boy, have been sentenced following a major drug crackdown operation by Greenwich officers.

The 27 men and one woman were arrested in connection with dealing class A drugs and other offences following a series of raids that were carried out between October and February.

During Operation Kraken, officers from the Greenwich gang unit recovered crack cocaine and heroin worth about £5,000 as well as designer goods, including Rolex watches, valued in excess of £60,000. About £18,000 in cash was also seized by police.

The operation targeted drug dealers and gangs in the capital, Essex, Northampton, Yeovil and Somerset.

Lee Hill, detective superintendent at Greenwich police, said: “We want to reassure the public that dealing drugs in the borough will not be tolerated and we will leave no stone unturned to bring offenders to justice. Drug dealers are harmful to our communities, they take advantage of vulnerable people and wreck lives.

“Officers continue on a day-to-day basis, targeting drug supply and gang-related activity on the borough. My warning to those who wish to get involved in this type of activity is prepare yourself to be caught. We will put you before the courts.

“The arrest of these people has been achieved not only through police investigation, but also through the intelligence received from the community to whom we are indebted.”

The offenders were sentenced at Woolwich Crown Court unless stated otherwise:

• Lee David Lugg, 26, of Park View, Sturry, Kent was sentenced to two years and eight months’ imprisonment after pleading guilty to six counts of supplying cocaine. He also received a five-year Criminal Behaviour Order.

• Nathaniel Eyewu-Ago, 31, of no fixed address, was jailed for three years’ for possession with intent to supply crack cocaine and heroin.

• Nathan Brown, 45, of no fixed address, was sentenced to 16 months’ imprisonment for supplying crack cocaine and heroin. He also received a five-year Criminal Behaviour Order.

• Jack Doherty, 19, of Kingsman Street, Greenwich was jailed for two years and two months’ imprisonment for supplying crack cocaine and heroin. He received a five-year Criminal Behaviour Order.

• Billy Lowden, 20, of Eglington Road, to two-and-a-half years imprisonment concerned in the supply of crack cocaine and for seven counts of supplying crack cocaine and heroin. He received a five-year Criminal Behaviour Order.

• Junior Renford, 23, of Deer Park Terrace, Harvey Gardens, was jailed for two-and-a-half years’ imprisonment for three counts of supplying crack cocaine, offering to supply crack cocaine, possession with intent to supply cocaine, possession of cannabis, possession of an offensive weapon, possession of criminal property. He also received a five-year Criminal Behaviour Order.

• James Dearsley, 62, of Rutland House, Greenwich was sentenced 12-month Community and Alcohol Treatment Order and 15 days’ Rehabilitation Requirement for permitting the use of premises for the supply of crack cocaine and heroin.

• Jermaine Fitzhugh, 20 of East Oval, Northamptonshire was sentenced at Northampton Crown Court to 18 months’ imprisonment, suspended for 24 months, for supplying crack cocaine and heroin.

• Hia Nguyen, 20 of Erwood Road, Greenwich was sentenced to 20 months’ imprisonment for four counts of supplying crack cocaine and heroin and possession with intent to supply crack cocaine and heroin betwee. He also received a five-year Criminal Behaviour Order.

• A 16-year-old girl was sentenced at Bexley Magistrates’ Court to a 12 month Intensive Youth Offender Panel Referral and ordered to pay £85 costs.

• A 15-year-old boy was sentenced at South East London Magistrates’ Court to eight months’ youth custody for four counts of supplying crack cocaine and heroin.

• A 17-year-old boy was sentenced to two years’ imprisonment and received a five-year Criminal Behaviour Order for three counts of being concerned in the supply of crack cocaine and cannabis, offering to supply cannabis and supplying cannabis between.

• A 16-year-old boy was sentenced to 13 months’ youth custody for 10 counts of supplying crack cocaine and heroin. He also received a three-year Criminal Behaviour Order.

Another 14 people were convicted and sentenced in connection with the Operation Kraken.