Spanish police are searching the headquarters of the ruling Socialist Party as part of an ongoing investigation into possible financial wrongdoing, the Civil Guard said on Wednesday.

The raid on the office in central Madrid is another blow to the party of Prime Minister Pedro Sanchez, whose Socialists have been hammered by a series of corruption scandals.

The Civil Guard said the police were under judicial orders to find material relevant to a National Court probe into accusations of corruption against former party members and other individuals.

The police said the search is strictly limited to a probe led by National Court Judge Santiago Pedraz into the possible wrongdoing of Socialist party member Leire Diez.

The case against Diez started in 2025 when audio recordings appeared in Spanish media of her apparent involvement in attempts to discredit a member of the Civil Guard’s anti-corruption unit. Further reports linked her to alleged attempts to influence the work of state prosecutors. The judge’s probe is targeted on seeing if she received payments from the party to allegedly carry out these efforts.

The Socialist party said she was acting on her own. Diez, who has left the party, has denied wrongdoing.