The popular Irish singer, Sinead O'Connor used social media to warn the Pope that if he comes to Ireland, there "would be a bloodbath". The singer posted the threat on her Twitter account after a poll was conducted on whether the Pope should visit Ireland. Previously, in 1992 during a TV show, O'Connor tore a photo of John Paul II into pieces and called him evil.
Sources: http://www.irishcentral.com/news/Sinead-OConnor-wants-to-shoot-Pope-Benedict-if-he-comes-to-Ireland-130522513.html
http://www.sundayworld.com/columnists/index.php?aid=8918
http://www.speroforum.com/a/61006/Irish-singer-wants-Pope-Benedict-dead