Who or what is in Dublin for them?
The IRA, a group that just loves to send explosive messages to British military and political entities. Pure speculation on my part.
Or they could just be wanting a few pints of Guinness before catching a connecting flight.
Well, I recall a bomb expert last spring claiming that pipe bombs used to booby trap buildings in Jenin were similar in detail to ones used in Northern Ireland. The expert believed that Palestinian bombmakers must have directly trained by IRA bombmakers.
Back in the day the Evil Empire used to host "symposia," or arrange "lecture tours," so terrorists from different parts of the globe could share their expertise. It would seem that sufficient ties were formed in that area that cooperation now continues without Soviet sponsorship.
There have been reports for years of the interaction of the Irish, German, Japanese, and Islamic terrorist groups. While they dont work together, they exchange info, arms, etc.