Thu May 4, 2017 05:27PM
A handout photo released on May 4, 2017 shows black smoke after an explosion hit a warehouse containing hazardous waste in Arganda del Rey, east of Madrid. (Photo by AFP)
A handout photo released on May 4, 2017 shows black smoke after an explosion hit a warehouse containing hazardous waste in Arganda del Rey, east of Madrid. (Photo by AFP)
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Some 30 people have been injured in a fire and several explosions in a waste treatment factory near the Spanish capital of Madrid.

Official on Thursday ordered evacuation of schools and offices near the Requimsa factory in Arganda del Rey after a blaze caused several explosions in the facility, where chemical waste is recycled.

Emergency services said three people had been seriously injured, two from burns and one with a fractured pelvis.

The cause of the blaze was unknown and an investigation is underway.

A similar fire erupted in the factory, located about 30 kilometers southeast of Madrid, in 2013. Some said it could be an act of sabotage, as the factory is located near residential buildings and treats chemical waste.

"It's a little bit suspicious and dangerous that there was the fire in 2013 and now this, because there are houses very nearby," said Samuel Vadillo, who lives close to the facility. The 21-year-old said loud explosions broke windows and blew doors open in his house.

The company that owns the recycling site said on its website that it “manages and collects all types of hazardous waste.”

The fire and explosions sent a dense column of smoke into the air. 

A handout photo released on May 4, 2017 shows black smoke after an explosion hit a warehouse containing hazardous waste in Arganda del Rey, east of Madrid. (Photo by AFP)

Authorities in the Madrid regional government sought to ease concerns about toxic pollution and said air quality in the region was normal, citing tests results. Residents, however, were urged to stay indoors for safety reasons.

“Neighbors have been asked not to leave their homes and to keep windows closed," a spokesman for Arganda del Rey's city hall said, reiterating, however, that several air quality measuring stations in the area showed normal readings.

Reports aid the evacuation order covered schools and workplaces in a radius of 500 meters around the factory.

There was no report of injury in the nearby schools.

Firefighter units were deployed to the scene of the incident and officials said there was no danger of fire spreading.