"According to preliminary data, as a result of the incident, three workers were killed, four injured were taken to medical institutions. Two employees are considered missing, "the ministry said on Twitter.
On the fact of the death of workers a criminal case was initiated on violation of security rules.
The causes of the incident are being clarified.
Earlier it was reported that during the explosion at the defense plant named after Ya.M. Sverdlova killed three people, three were injured and three were missing.