At least one person was killed and over 50 people were injured after a powerful explosion hit an optical-mechanical factory in Russia's Moscow Oblast, local media reported on Wednesday.
The blast occurred in a warehouse containing pyrotechnic equipment in the town of Sergiyev Posad, 50 km (30 miles) northeast of Moscow, on Wednesday.
The cause of the accident is under investigation.
Russia's TASS news agency cited emergency services as saying they did not suspect that the blast had been caused by a Ukrainian drone attack.
(With input from agencies)