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Depending on the type of rocket fuel used, launches produce nitrogen oxides, chlorine, black carbon particles, water vapor, carbon monoxide and carbon dioxide — and no propellant avoids creating of some kind of emissions.

"Seventy of the patients have burns and carbon monoxide poisoning," she said, according to AFP news agency.

Damaged lithium-ion batteries are at high risk of catching fire and releasing toxic gases such as hydrogen fluoride and carbon monoxide.

Tests for carbon monoxide poisoning were negative, and no significant gas leaks were detected.

Investigators have ruled out carbon monoxide poisoning, and the gas company determined there were no major issues with any of the gas lines at the home.