Officers said the arrests, for a number of minor alcohol related and disorderly offences, represented a "tiny minority" of the 50,000 festivalgoers and the event, headlined by rock band The Killers on Thursday and DJ David Guetta on Sunday, had been a "huge success".A total of 17,500 units of alcohol were seized at Boucher Road Playing Fields.South Belfast Superintendent Mark McEwan said: "I believe that it has been a very successful festival and I am pleased that the city of Belfast has hosted yet another large event so well. "This is no coincidence, I believe that it is down to the hard work of the organiser, all agencies involved, and the attitude of the music fans themselves."Organisers said over 30,000 music fans turned out to see David Guetta play a set packed with hits including Shot Me Down, Play Hard and Titanium on Sunday evening.Sarah Shimmons, from Tennent's NI, said: "Together with our partners MCD, we'd like to say a huge thank you to the Tennent's Vital fans for helping make the 2014 festival such a huge success."Superintendent Mark McEwan continued: "Over the two nights there were a total of 17,500 units of alcohol seized and 13 arrests made. This is a tiny minority when it is considered that there were 50,000 people there and I view the event to be a huge success overall".