Competencia abre expediente a los seis grandes bancos españoles por la guerra hipotecaria

Further details are available from the source about a recent development. A regulatory body is taking action against major financial institutions. The action involves several prominent banks in the country, with a total of six entities affected.

The situation is related to a specific issue in the financial sector. More information can be found through the source, which provides additional context. Action has been initiated by the relevant authority, but specifics are limited.