Dissident Republican groups continue a campaign of violent attacks aimed at police and military targets, but have very little public support. Security alerts usually have no effect on visiting tourists (other than roads being closed), but be aware of the potential danger. You can follow the Police Service of Northern Ireland (PSNI) on Twitter (@policeserviceni) and receive immediate notification of any alerts. You will notice a more obvious security presence here compared to elsewhere in the UK and Ireland, such as armoured police Land Rovers and fortified police stations. There are doormen on many city-centre pubs.