https://www.independent.ie/irish-news/dissident-bomb-fuels-fear-of-return-to-terror-after-brexit-37731387.html
A bomb set off in Derry last night has raised fears that a hard Brexit could see an increase in dissident terror. The New IRA is believed to be responsible.
Garda and PSNI have both expressed concern that in the event of a hard border after Brexit, there could be a new surge of violence from dissidents:
//Several key figures in the dissident groups are due for release from prison in the coming months and they are expected to influence a re-organisation as they focus on the fall-out from Brexit.
A hard Border could potentially open up opportunities for them to recruit members and fundraise through smuggling and other criminal activities.
...
The New IRA, formed in 2012, poses the biggest threat from dissident republicans since the Provisional IRA, according to an assessment by the head of the Garda intelligence and security section, Assistant Commissioner Michael O'Sullivan. That assessment is shared by the PSNI, which is also seriously concerned about the impact of a hard Brexit.//