Jail bosses have launched a major investigation after a 42-year-old drug dealer was sliced in the face in a "shiv" attack in Mountjoy Prison.
Alan Coffey received several cuts to the head and face when he was attacked by two other inmates on the B2 landing in the Dublin facility at about 4pm last Friday.
Coffey, who is in the closing stages of a 15-year sentence for possessing heroin valued at €5.75m and a 9mm semi-automatic Glock pistol, did not require hospital treatment as his injuries were treated in the prison.
The two inmates suspected of carrying out the attack have since been transferred to a basement area of the jail and are set to face disciplinary sanctions.
They are Alan White (28), from Dublin's south inner city, who is serving a sentence of one year and nine months for criminal damage; and Paul Reilly (37), from Sheriff Street, who is serving a five-and-a half-year term for robbery, which was imposed last December.
It is not known why Coffey was targeted in the incident, which was the second knife attack to happen in Mountjoy Prison last week.
Last Tuesday, Thomas Fox (29), who has been charged with the murder of Gareth Hutch, was knifed after a row broke out in an incident in which his associate Michael Taylor (36) was stabbed in the torso.
Sources say that the earlier incident is now being treated as being motivated by the Kinahan cartel feud, and the attack on Fox may have been ordered by a feared thug who is also on remand in jail in relation to a feud murder last year.
Last night, sources said the latest attack on Coffey, who has been in jail since November 2007, is not considered to be linked to the feud.
Dublin Circuit Court heard that, in June 2006, he was under surveillance after gardai received confidential information.
A search of Coffey's Co Meath home revealed two large boxes, which contained 28.75kg of heroin worth €5.75m, in the kitchen. Coffey told gardai the drugs were cocaine and he was taking responsibility.
A search of a Volkswagen Passat outside his home revealed a semi-automatic pistol.
Coffey lost an appeal against his conviction in March 2009.
Apart from the heroin and handgun, officers also discovered €13,900 cash in a sock, and two small amounts of cocaine worth €2,909 in the pockets of a jacket and hooded top in a wardrobe.
Coffey had a number of convictions, including theft, public order and road traffic offences.
At the time, the seizure was the biggest heroin haul in the history of the State.
Coffey's mother told the court that her son had three sons and three daughters. He is due for release in December.