A major fire at an oil refinery in central Croatia has left four firefighters injured, one seriously.

The fire broke out Monday at the refinery in the town of Sisak. Officials say it took 130 firefighters to bring the blaze under control.

Reuters news agency quotes the national oil company, INA, as saying the cause of the blaze was crude products catching fire. Officials say an investigation is under way.

The Sisak refinery has a capacity of about 60,000 barrels a day and is co-owned by INA and Hungary's MOL company.