A large accidental explosion of ammunition at a Russian military test site near Orenburg caused more than 10,000 residents to flee from their homes.
The explosion of more than 4,000 tons of shells, including bombs and rockets, released giant clouds of smoke over the region and injured one military officer near the site, according to local reports.
Russian military prosecutor Yebgeny Ivanov told local media that the enormous blasts were set off by a fire that may have been caused by someone smoking at the test site.
In recent years, Russian military equipment, which frequently dates back to the Soviet era, has exploded unexpectedly several times at test sites. Some accidents have been blamed on safety violations.
Russian military police have launched a criminal investigation into the suspected mishandling of weapons.