Queen's University Students' Union has revealed it is investigating one of the four people charged with conspiring to bomb London over allegations of voting fraud in a student election. Darren Mulholland from Dundalk is one of the students under investigation over alleged impersonation in student elections. The 19-year-old was one of four people who appeared in a London court last week charged in connection with an alleged plot to bomb the city. Mr Mulholland could not be contacted.