Washington D.C., Aug. 19 -- : The United Nations on Sunday appealed for more humanitarian aid for Venezuelan refugees pouring into neighbouring countries, where they are overwhelming social services and reportedly sparking local tensions.

UN High Commissioner for refugees, Filippo Grandi, had planned to visit the Brazilian town of Pacaraima this weekend, but authorities reportedly advised him to cancel the trip amid fears of protests by residents who are unhappy with the arrival of more than 500 Venezuelans each day.

Last week, the residents of Pacaraima closed shops and marched through the streets, raising slogans such as "Out with the Venezuelans", "Pacaraima is ours", "Out with the UN", and "Brazil for Brazilians".

Grandi said financi...