LONDON — The flood of Syrian refugees pouring into the heart of Europe is unlikely to ease anytime soon, and worsening conditions in Iraq could send new waves of displaced people onto the Continent, United Nations officials warned on Friday.

“I don’t see it stopping,” Amin Awad, director of the Middle East and North Africa division of the Office of the United Nations High Commissioner for Refugees, told reporters in Geneva. If anything, he said, the thousands of refugees arriving daily at the borders of European countries may be “the tip of the iceberg.”

The warnings came as the impact of the European Union’s decision on Tuesday to apportion 120,000 migrants among member countries — in some cases, against their leaders’ wishes — continued to ripple across the Continent.

Perhaps the most vitriolic demonstrations were in Finland, which abstained from the vote on Tuesday. Images of a protester wearing a robe and hood resembling those of the Ku Klux Klan ricocheted across the Internet on Friday.