Britain's U.K. Independence Party stormed to victory Sunday in European elections, riding a tide of Euroskepticism and anxiety about immigration to beat Prime Minister David Cameron's Conservatives and the opposition Labour Party, partial results showed.

With 56 out of 73 seats declared, UKIP — which wants to pull Britain out of the European Union — had won 28.6 percent of the vote, ahead of both the Conservatives and Labour, while the Liberal Democrats had won just a single seat.

If borne out by full results, it will be the first time UKIP has won a national election and the first time such an election has not been won by either the Conservatives or Labour since 1910.