By Sarah Morland (Reuters) – The head of the United Nation’s drugs and crime office on Thursday warned of a “vicious cycle” of arms trafficking to increasingly powerful Haitian gangs, fueling an internal conflict and worsening violence across the Caribbean. “It’s more important than ever to take every measure possible to prevent illicit flows,” the UNODC’s executive director, Ghada Waly, told a U.N. Security Council meeting, saying arms trafficking and gang activity were feeding off each other. A recent UNODC report found that most illegal firearms seized in Haiti came from the United States, …