Talks between unions and company representatives have failed to reach accords on pay rises, hours, breaks, excess hours worked and professional growth, Spain's largest union Comisiones Obreras (CCOO) said in a statement.

The CCOO has asked the Spanish labour mediation agency SIMA to intervene in talks to avoid a strike, it said.

(Reporting by Robert Hetz; Writing by Paul Day; Editing by Jesús Aguado)