Gardaí have located and arrested a man who escaped from an open prison in Co Cavan last month.
He was arrested in Dublin today.
In July 2006, Mangan was caught with over €2m worth of cannabis. The following year, he was caught with a loaded pistol in his trousers.
Mangan was due to have completed his custodial sentences in less than three years.
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However, it is understood he had recently been caught with a smartphone in prison, which is against the regulations.
It is now understood he will be returned to a closed prison.
An investigation is also under way into his escape from the open prison.