Exactly one year after warring gangs shut down transportation links to the southern regions of Haiti, armed groups continue to restrict access to vulnerable communities in Port-au-Prince, forcing thousands of others from their homes on the eastern outskirts of the capital and creating travel problems in the north of the country, the United Nations said Friday. At least 188 people have been killed and almost 17,000 people have been displaced from Port-au-Prince since April 24 by gangs, U.N. spokesman Stephane Dujarric said, citing data from the Office of the United Nations High Commissioner for…