Photos showing the aftermath of "black rain" that fell in Tehran following Israeli strikes on fuel depots have appeared in the media. Dense black smoke rose over the city, while dark precipitation fell dozens of kilometers from the capital, Time reports.

According to the Iranian Red Crescent Society, precipitation resulting from large fires can be extremely dangerous and acidic in nature, capable of causing chemical burns to the skin and serious lung damage.

The World Health Organization also warned of possible health risks, The Hill reports. WHO spokesman Christian Lindmeier noted that "black rain" can cause respiratory problems due to the spread of toxic pollutants.

"We are in contact with hospitals and authorities, and Iranian authorities have already issued a warning urging people to stay indoors, especially given the attacks on oil storage facilities," he said.

According to WHO, "massive releases" of toxic hydrocarbons, sulfur oxides and nitrogen compounds have occurred in the atmosphere. Authorities urged residents to avoid going outside where possible, as each of these substances can pose a danger to human health.