Prime Minister Viktor Orban said last week that a new fence being built on the Serbian border equipped with surveillance tools would withstand even a major surge of migrants, which Hungary is anticipating this year partly because of the deteriorating deal between the European Union and Turkey to prevent migrants from reaching Greece. Several aid groups, including Doctors Without Borders, have denounced numerous cases of migrants returning to Serbia from Hungary with dog bites and injuries from reported beatings by border patrols. Recent changes to Hungary's asylum policy, allowing the detention of all migrants, including children over 14, in border container camps, have also been the target of sturdy criticism by U.N. agencies and human rights advocates.