(CNN) The body of a woman has been found buried under rubble following an explosion caused by a gas leak in central Paris, bringing the death toll of the disaster to four, a spokesman for the Paris prosecutor told CNN on Sunday.

The blast, which occurred at a bakery at 9 a.m. local time on Saturday, killed two firefighters who were responding reports of the leak, while a Spanish national died hours after the incident in hospital.

"Profound sadness. Standing by the families of victims. The nation shares in their pain," French Interior Minister Christophe Castaner tweeted after the explosion, adding that 10 people, including a firefighter, were seriously injured and a further 37 were "in a state of relative emergency."

Pictures from the scene, on Rue de Trevise in the 9th arrondissement of the French capital, showed smashed windows and scattered debris across the street, as fire crews evacuated people from apartments above the bakery.

Firefighters intervene after the explosion of a bakery on the corner of the streets Saint-Cecile and Rue de Trevise in central Paris on January 12, 2019.

"At this stage, we can tell the origin of the explosion is accidental, a gas leak, but we should remain prudent as an ongoing investigation will determine the causes of this," Heitz said.

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