At least 37 people have died after a Russian drone struck a warehouse near Kyiv’s western suburbs overnight, sparking a huge fire and explosions, authorities said Saturday.

The warehouse appeared to have been storing “explosive objects,” Ukrainian prosecutors said, opening an investigation into criminal negligence.

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Officials did not give details about the nature of the facility.

Both Russia and Ukraine have intensified long-range strikes on each other in recent months, sparking fires and sending civilian casualties to record levels.