At least 13 people were killed and dozens of others injured in an overnight Ukrainian drone attack in the republic of Tatarstan, regional officials said Monday morning, with media reports suggesting that a petrochemical plant was struck. Radmir Belyayev, the mayor of the industrial city of Nizhnekamsk, said drones targeted both civilian and industrial sites during the attack. Unverified reports said the Nizhnekamskneftekhim petrochemical plant, which produces synthetic rubber and plastics, was hit during the overnight attack. The city was previously attacked in June, when Ukrainian drones targeted Tatneft's Taneco oil refinery. Russia's Defense Ministry said it intercepted 456 Ukrainian drones in Russia and annexed Crimea between Sunday night and Monday morning.