A Ukrainian drone attack killed one person and sparked a fire at one of Russia’s largest oil refineries in the city of Yaroslavl, Russian and Ukrainian authorities said Friday.

Yaroslavl region Governor Mikhail Yevrayev said one civilian was killed and 27 others were injured after falling drone debris hit an intercity bus.

He claimed that all 67 Ukrainian drones were downed over the region, but that drone debris fell on residential areas, commercial properties and “industrial infrastructure.”

Ukraine’s military said it struck the Slavneft-Yanos refinery, which it said provides fuel and lubricants to the Russian military. President Volodymyr Zelensky later confirmed the attack and said

Ukraine’s military said it struck the Slavneft-Yanos refinery, which it said provides fuel and lubricants for the Russian military. President Volodymyr Zelensky later confirmed the attack and added that Ukraine’s SBU security service had struck a Tu-95MS missile-carrying aircraft in the Saratov region city of Engels.