US dignitaries attending this weekend's 1916 events in Dublin have been advised of the risk they may be caught up in the ongoing feud between two of the capital's criminal gangs, according to a security briefing seen by RTÉ's This Week.

The alert is contained in a special 'threat assessment' for the Easter weekend events here which was carried out by the Irish branch of the United States Overseas Security Advisory Council - a body set up and operated by the Bureau of Diplomatic Security at the US Department of State and which is connected to the US embassy in Dublin.

The three-page document is marked "for US private sector security purposes only".

While the memo says that the greatest risk of begin caught up in violence is in Northern Ireland, it provides a detailed briefing on the current feud between the Kinahan and Hutch gangs in Dublin, which has led to at least three deaths.

The document provides an explicit warning that "additional criminal incidents and assassination attempts related to the recent string of violence are possible".

The threat assessment was circulated to Ireland-based members of the OSAC, who are primarily American businessmen and women, diplomats and other key US figures working or seconded here.

The threat assessment notes that the Continuity IRA was initially linked to the shooting of two men in the regency Hotel in Dublin on 5 February, which was the most bloody incident in the feud so far.

While the security briefing notes that the CIRA later rescinded that claim, the document makes specific reference to the "possibly related assassination" of Vincent Ryan, a prominent dissident republican, three days after the regency Hotel incident, and goes on to warn that "though the parties involved do not specifically target the general public or the private sector, violence linked to organised crime and dissident actions in Ireland can occur in indiscriminate locations and cause collateral damage".

High level US dignitaries attending 1916 events are also specifically told to "avoid speaking about events" connected to the celebration of Rising, given what it says are lingering political sensitivities surrounding some of the issues, and the risk they may be misinterpreted in what they say. 

The US embassy did not respond to queries from This Week on the contents of the document in recent days.