European stock markets declined following the European Central Bank's (ECB) decision to cut interest rates. The Stoxx 600 index fell by 0.5% as of mid-afternoon London time, with all sectors except oil and gas experiencing losses. The market reaction reflected investor caution in response to the ECB's monetary policy move and comments from ECB President Christine Lagarde. Shares of companies such as Siemens Energy were among those affected. This marked the second consecutive session of declines for European equities amid ongoing uncertainty about the economic outlook and central bank actions.