MOSCOW, January 25. /TASS/. According to preliminary data, the fire that occurred at the Ufaorgsintez plant in Ufa was preceded by an explosion, a source in emergency services told TASS on Monday.

"The explosion occurred before the fire outbreak. According to preliminary data, this was due to a breach of safety regulations," the source said.

A source told TASS earlier that two methane-hydrogen tanks with the capacity of 25 cubic meters were on fire at the plant. One of them collapsed and a plant worker was injured. The fire broke out on an open site.

Ufaorgsintez specializes in gas processing and oil refining. The plant produces polypropylene, polyethylene, phenol, acetone and other petrochemical products.