Two of the injured were in a critical condition, Miquel Buch, from the Catalan regional government, told TV3.
A spokesman in Catalonia's rescue services, which provides disaster relief in the region, confirmed someone had died in a nearby building that collapsed, adding that it could not confirm yet if this was linked directly to the explosion or fire.
One person died as a outcome of an explosion at a chemical factory in Spain's north-eastern Tarragona province, Spanish media reports.
Another person was killed in a nearby house destroyed in the blast, officials said.
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An enormous explosion at a petrochemical plant in northeastern Spain has killed one person and injured at least eight others, according to authorities.
Since the blast is declared as a chemical accident, the civil protection agency in the country has warned the city of 0.8 million to stay indoors as a measure of precaution.
While the blaze has been brought under control, local authorities said they had yet to identify the second victim at the factory.
The fire could been seen for miles, and local residents posted videos showing the aftermath of the blast with flames and a big column of black smoke emerging from an area dotted with big industrial tanks.
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The World Health Organization and the Chinese authorities are taking measures to ensure that the disease does not spread. Authorities didn't provide further details about the patient's background or how she may have contracted the illness.
However, authorities said there was no evidence of any "toxic cloud".
The factory began operations in June 2017 and had been operating normally, he added, prior to Tuesday's explosion of a 20-tonne tank full of ethylene oxide.
Tuesday's explosion comes just over a month after a December 11 blaze at a solvent and industrial residues recycling plant in the northeastern town of Montornes del Valles.
Tarragona is located 115 kilometres southwest of Barcelona, the regional capital of Spain's Catalonia region.
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