A stash of drugs worth around £900,000 was seized during police raids in Rochdale.
Three people were arrested after police raided properties in Sykes Street and Hardwicke Street on Friday.
Warrants were executed as part of a wider investigation into the Deeplish and Newbold drugs supply.
Police seized a quantity of suspected Class A drugs with an estimated street value of £900,000.
Two men, 37 and 39, and a woman, 35, were arrested on suspicion of being concerned in the supply of class A drugs.
All three remain in police custody for questioning.
Inspector Andrew Fern, of GMP's Rochdale district, said: "Enquiries are ongoing but the initial indication is that, this morning, officers seized class A drugs with an estimated street value of £900,000. Drugs blight communities so this is a really positive result.
"Three people are in custody but our investigation is ongoing and I would encourage anyone with information about the supply of drugs in Rochdale to contact us.
"Investigations of this nature rely partly on intelligence from members of the public living in our communities so I would like to use this opportunity to appeal to anyone who thinks they may know something which may help us rid the streets of drugs to get in touch."
Anyone with information should contact police or Crimestoppers, anonymously, on 0800 555 111.
