BERLIN (AP) — German Chancellor Angela Merkel says the potential benefits resulting from the influx of migrants and refugees far outweighs any dangers. European Union leaders managed to agree early Thursday to boost border controls to manage the influx and to send 1 billion euros ($1.1 billion) to international agencies helping refugees at camps near their home countries. The leaders also said that task forces of European experts sent to help register and screen migrants in so-called hotspots must be fully operational in Greece and Italy, and perhaps also Bulgaria, by November. Serbia banned imports of Croatian goods Thursday to protest the closure of the border to cargo traffic, which has cut Serbia off from its main trading partners in Europe.