Fifteen people were arrested today in a new series of raids by police investigating serious crime in Derry.
A PSNI spokeswoman said the arrests were made by detectives investigating "serious and organised crime".
Ten men and five women were detained in the Gobnascale and Waterside areas in a pre-planned operation linked to an inquiry which began last summer.
Offices and homes were also searched by officers working under the Proceeds of Crime Act 2002.
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It is understood the 15 were detained for questioning after 10 separate searches.