Gardaí in Donegal continue to prepare a file for the Director of Public Prosecutions with respect to the October 7, 2022 Creeslough explosion.
A woman and a man in their 40s, arrested yesterday morning as part of the ongoing investigation, have been released without charge.
In total, four people have been arrested in connection with the explosion that claimed 10 lives at a service station in the Donegal village.
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In March, two men in their 50s were arrested and subsequently released.
Gardaí in Milford are heading up the multi-agency criminal investigation as work on the DPP file continues.