Spanish police searched the headquarters of the ruling Socialist Party in Madrid on Wednesday as part of an ongoing investigation into possible financial wrongdoing, according to the Civil Guard.

The search was conducted under judicial orders to find material relevant to a National Court probe into accusations of corruption against former party member Leire Díaz, who was involved with a state-run company. The Civil Guard confirmed the operation is strictly limited to the investigation led by National Court Judge Santiago Pedraz.

The case against Díaz began in 2025 when audio recordings surfaced in Spanish media allegedly showing her involvement in attempts to discredit a member of the Civil Guard's anti-corruption unit. Additional reports linked her to alleged attempts to influence the work of state prosecutors. Díaz, who has since left the party and denied wrongdoing, was described by the Socialist Party as acting independently.

The search represents another challenge for Prime Minister Pedro Sánchez's Socialist Party, which has faced multiple corruption investigations. Sánchez's wife and brother are being investigated over allegations of influence peddling, which both have denied. A former minister under Sánchez and a senior party official are being investigated regarding allegations of involvement in a kickback scheme that allegedly began during the COVID-19 pandemic.

Separately, former Prime Minister José Luis Rodríguez Zapatero is being investigated in connection with a government airline bailout. All individuals have denied wrongdoing in their respective cases.

Sánchez, who has served as prime minister since 2018, has characterized the cases involving his family as a "smear campaign." However, the corruption allegations against former associates led him to ask the nation for "forgiveness" in 2025. His minority government continues to operate with support from a junior coalition partner, and Sánchez has not been directly linked to any of the scandals under investigation.