Neither the left nor the right bloc are anywhere near an absolute majority in the 350-seat assembly following Sunday's polls.
Far-right party Vox became the third-largest party in Spain's parliament following a national election on Sunday, winning 52 seats, up from 24 at its debut in April.
Hundreds of people packed a square in front of Catalonia's regional government headquarters in Barcelona for a rally by the centre-right, pro-union Ciudadanos party.
Supreme Court jails nine separatist leaders to between nine and 13 years for sedition over banned 2017 referendum and independence declaration, sparking angry protests in Barcelona.
Spanish Prime Minister Pedro Sanchez said his country needs to hold a new general election on November 10 after he was unable to win support from other parties for another term.
The floods have so far claimed six lives in Spain, with train and air services were disrupted.
More than 100 migrants stranded off the Italian coast cannot find a home, as Italy refuses to let them ashore until EU states offer them sanctuary.
Talks between Pedro Sanchez's Socialists and Podemos have proved difficult and tensions between the two parties have reached a new high, with both camps suggesting talks were all but dead amid mutual reproach.
The economic bloc will take a decision on the new EU officials, following the elections that shook up traditional alliances.
Spanish Prime Minister Pedro Sanchez’s Socialist party (PSOE) won 123 parliamentary seats out of 350 — short of an absolute majority.
Meet the candidates running for prime minister: Pedro Sanchez, Pablo Casado, Albert Rivera, Pablo Iglesias and Santiago Abascal.
Spain's Prime Minister Pedro Sanchez faced an onslaught of criticism from his right-wing rivals over Catalonia's secession ahead of the general elections on April 28.
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