PORT-AU-PRINCE (Reuters) - Medecins Sans Frontieres (Doctors Without Borders) is temporarily shuttering an emergency clinic in Haiti's capital Port-au-Prince, the medical charity said on Thursday, after armed men stopped an ambulance, forcibly removed a severely wounded patient, beat him and then shot him dead. Escalating violence from armed gangs in the Caribbean nation has forced many aid groups to cut operations due to lack of safety for staff and patients, as well as dwindling budgets due to underfunded campaigns. The limited reach of aid groups, including for victims of mass sexual violence, increasingly leaves healthcare in the hands of small, cash-strapped local organizations.