Local authorities have not disclosed further details about the targeted site.Engels lies around 600 kilometers (370 miles) from the front lines in Ukraine. The Kyiv Independent could not immediately verify information. Roman Busargin, governor of the Saratov region, confirmed via his official Telegram channel that the attack had impacted an industrial enterprise in Engels, but  did not specify which facility was affected.Several explosions were heard in the area, according to local reports from Russian Telegram channels. Mikhail Isayev, the acting head of Engels district, said that schools in the city would switch to remote learning due to the ongoing threat of further drone strikes.The airports in the cities of Kazan, Kaluga, Saratov, and Tambov have suspended flights following Ukrainian drone attack.