PERM, March 1 (RIA Novosti) – Twenty-seven people were hospitalized on Friday after a chlorine leak at a factory in central Russia’s Perm region, emergencies workers said.

Medical officials said only four of the 27 were currently receiving medical treatment, while the rest were under observation in hospital.

The leak occurred early on Friday at a liquid chlorine production factory in the city of Berezniki.

An Emergencies Ministry official told RIA Novosti later on Friday the situation was now under control.

Three people died in Berezniki in November 2012 after a chemical leak at a local factory. Investigators said ventilators were not functioning at the factory.

Almost 30 people were also hospitalized after a leak at a non-ferrous metals delivery point in the Perm region’s Kirov district in July 2011.