Seven men and one woman are due to appear before a special court sitting this afternoon after Gardaí seized drugs and cars in a major operation.
Nine people were originally arrested as part of the operation targeting the supply of controlled drugs.
Gardaí said one woman has now been released without charge.
The operation saw officers from Roscommon/Longford division - assisted by the Drugs and Organised Crime Bureau and the Armed Support Unit - carrying out a number of searches on Wednesday morning.
Seven men and two women were detained, ranging in age from 18 to 55-years-old.
They are being held at garda stations in Roscommon and Longford under Section 4 of the Criminal Justice Act.
The drugs seized include cannabis, cocaine and heroin - while three cars were also seized as part of the search operation.
Speaking at Longford garda station, Superintendent James Delaney said: "This morning’s operation, involving over 50 gardaí, focussed on the disruption of criminal gangs and their activities in the distribution of controlled drugs in the greater Longford area.
"The operation has caused significant disruption to those who are engaged in this type of activity.
"This type of operation is dependent on highly specialised gardaí attached to the Garda National Drugs and Organised Crime Bureau, supported by local gardaí from the Divisional Drugs Unit.
"It is strong evidence of the continued commitment of An Garda Síochána to enhancing the quality of life in our communities by removing and disrupting this kind of activity from our streets and towns."
The seven men and one woman will appear before a special sitting of Longford District Court at 4:30pm.