UNITED NATIONS, United States, Oct 29, 2025 (BSS/AFP) - UN chief Antonio Guterres is "greatly concerned" by the number of casualties from a massive Brazilian police raid on Rio drug gangs, which left scores dead, his spokesman said Wednesday.

"He stresses that the use of force in police operations must adhere to international human rights law and standards, and urges the authorities to undertake a prompt investigation," Stephane Dujarric told reporters.