The death toll from a powerful explosion at an industrial plant in Russia’s Ryazan region has climbed to at least 20, with 134 others injured, emergency officials confirmed on Sunday.

The blast, which occurred last week southeast of Moscow, reportedly began with a fire inside a workshop. Governor Pavel Malkov first announced the blaze on August 15 but provided no details about the facility’s operations or what triggered the ignition.

Russian media have not clarified what the plant was producing, while authorities have avoided confirming whether explosives, chemicals, or military equipment were involved.

Local emergency headquarters said: “Twenty people died as a result of the emergency incident. There are 134 injured, of which 31 patients are in hospitals in Ryazan and Moscow, while 103 patients are undergoing outpatient treatment.”

Emergency workers remain focused on treating survivors and securing the site.

The disaster is one of the deadliest industrial accidents in Russia this year and comes amid renewed scrutiny of workplace safety standards in factories nationwide.

Authorities have yet to release further details on the cause of the explosion, and investigations are ongoing.