Spain's governing Socialists won the country's third election in four years, but have fallen short of a majority, BBC reports.
PM Pedro Sánchez's party polled 29% and will need the help of either left-wing Podemos and regional parties, or the centre right, to form a government.
For the first time since military rule ended in the 1970s, a far-right party is set to enter parliament.
Vox opposes multiculturalism, unrestricted migration, and what it calls "radical feminism".