A total of fifteen addresses have been raided across Donegal early today as part of a crackdown on organised crime.
More than 100 Gardai took part in the operation which also targeted gangs in Sligo, Monaghan and Tyrone.
The raids were part of a crackdown against gangs suspected of being involved in drug dealing and money laundering offences.
Premises in East Donegal and Letterkenny were raided as part of the Donegal operation.
A man, aged in his 30s, was arrested in Co. Donegal and is currently being detained at a station in the Garda North Western Region under Section 50 of the Criminal Justice Act 2007.
Led by Detectives from the Donegal Division, this operation was supported by the Garda National Drug and Organised Crime Bureau (GNDOCB), the Armed Support Unit (ASU), the Garda Dog Unit and detectives from Sligo and Monaghan.
More than €26,000 in cash, £12,000 in sterling and quantities on cocaine, cannabis and tablets – with an estimated street value of €40,000 – were seized by Gardaí, as well as mobile phones and other electronic devices.
Searches were also conducted in Co. Tyrone by officers from the Police Service of Northern Ireland.
Gardai say their investigations are ongoing.