BARCELONA, Spain (AP) — Police in Spain searched the headquarters of the ruling Socialist Party on Wednesday as part of an investigation into possible financial wrongdoing linked to three former party members and other individuals who allegedly tried to influence police and legal cases.

The search of the office in central Madrid is another blow to the party of Prime Minister Pedro Sánchez, whose Socialists have been hammered by a series of corruption scandals to his some of its leader’s closest confidants, his wife and brother and the previous Socialist to hold his office.

“We respect the justice system, we will collaborate with the courts and there is the commitment in the Socialist Party that if there are new episodes of improper behavior, we will act with the same firmness we always have,” Sánchez told a news conference in Rome.

Sánchez, who has been Spain’s leader since 2018 and is a major critic of U.S. President Donald Trump, has not been directly named in any investigation.

A court statement issued on Wednesday said that judge Santiago Pedraz ordered the Civil Guard to “confiscate diverse documentation and electronic archives in an investigation of a ring designed to destabilize judicial processes that were affecting the ruling party.”

The searches were strictly limited to that case, and not a wholesale raid of the offices, the police said.

The case against started in 2025 when audio recordings appeared in Spanish media of then party member Leire Díez apparently involved in attempts to discredit a member of the Civil Guard’s anti-corruption unit. Further reports linked Díez to alleged attempts to influence the work of state prosecutors. The judge’s probe is targeted on seeing if she received payments 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.

The judge said that in addition to Díez, he is now also probing the alleged involvement of former Socialist heavyweight Santos Cerdán — who is already under investigation in a separate corruption case — as well as a former member of the regional government of Andalusia, a police officer, a business owner and two lawyers. The judge is investigating them on suspicions of bribery, making false testimony, forging commercial documents, influence peddling, and corruption.

Legal woes mount

The searches add to a growing list of legal cases that are hounding Spain’s Socialists.

A separate court said last week it was investigating former Prime Minister José Luis Rodríguez Zapatero in connection with a government airline bailout. Zapatero, who was in power from 2004-2011 and is a major backer of Sánchez, has denied any wrongdoing.