Ten men have been arrested in connection with the supply of drugs following a series of dawn raids.
Warrants were executed at addresses on New Hall Lane, Ringwood Road and Great Townley Street in Preston, as well as at addresses in Greater Manchester.
Four men from Preston aged 27, 30, 28 and 27 were arrested on suspicion of conspiracy to supply Class A drugs – heroin and cocaine.
A further six men from Greater Manchester were also arrested in connection with the supply of drugs, and all 10 remain in police custody.
Detective Inspector Simon Brooksbank of Lancashire Constabulary’s Serious and Organised Crime Unit said: “This morning’s arrests are as a result of a significant operation that has been on-going for more than twelve months in which we have already made numerous arrests, seized heroin, cocaine, amphetamine and cannabis with an estimated street value of £18.5 million.
“Action like this is part of our commitment to tackle and dismantle groups involved in organised crime impacting on Lancashire and our surrounding counties.
“Organised Crime Gangs (OCGs) do not see force borders as a barrier in their transportation and dealing of illegal drugs and neither do we when we work in partnership with other forces to tackle this sort of activity.
“The arrests today were supported by our colleagues in Greater Manchester and highlight the importance of working together to target and disrupt OCGs.
“The activities of these individuals have a dramatic effect on our communities causing serious anti-social behaviour and disruption to local neighbourhoods, and we are determined to tackle them head on.