Partial results in Spain's election show the incumbent Socialists winning the most votes in the general election but falling well short of a majority. The far-right, meanwhile, has made strong gains.

The provisional results, with 50% of the ballots counted, show that Prime Minister Pedro Sánchez's party has won 126 seats and the far-left United We Can got 35. That is still 15 seats short of the 176 majority in the 350-member lower house.

If the results stand, that would mean Sánchez would also need to rely on smaller parties and separatists to stay in office.

The right-wing bloc would be short of a majority, according to the partial results. With 67 seats, the once-dominant Popular Party has lost almost half of its presence in the Congress of Deputies, losing votes to the center-right Citizens party, which grabbed 53 seats and far-right party Vox won 23.

Spain's Interior Ministry says that turnout was over 75%, well above the average in the previous 12 elections since Spain returned to democratic rule.