They were arrested yesterday for criminal activity in the midlands and the east.
Five people are still being questioned about allegations of impersonating Gardai.
Detectives investigating a criminal gang involved in theft and fraud carried out six searches in three counties in the east of the country yesterday morning.
Four men, aged from their 30s to 60s, and one woman in her 50s were arrested.
3 thousand euro in cash, five vehicles, and three Rolex watches were also seized.
Investigations have been ongoing into the gang's activity in 15 counties, mainly in the midlands and the east over the past 10 months.
The arrests relate to members of the gang calling to rural homes, impersonating a Garda officer, claiming they were investigating burglaries in the area where sums of cash had been stolen and they were attempting to identify the owners.
They requested to compare money in their possession against cash held by the home owner and then proceed to take it away from the home owner.
Gardaí are reminding people they will never cold call to a house and request to check money in this manner.
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