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By The Associated Press and Phil Helsel

The death toll in a series of powerful explosions that rocked the Chinese port city of Tianjin has risen to 85, state media reported Saturday, citing local authorities.

Officials said Saturday that 21 firefighters are among the dead. Forty-four people have been rescued after the powerful explosions erupted at a warehouse containing dangerous chemicals at around 11:30 p.m. local time Wednesday (11:30 a.m. Tuesday ET), state media reported. More than 720 people have been injured.

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Tianjin Fire Department head Zhou Tian said the fire has mostly been extinguished at the site of the explosions, state news agency Xinhua reported.

Friday morning, rescuers found a 19-year-old firefighter alive, more than 31 hours after the explosions.

Authorities in Tianjin say the explosions and fires have so far not caused any detectable air or water contamination, The Associated Press reported. But they have no clear picture of what was stored there because the materials were in temporary storage and the site, owned by Ruihai International Logistics, was badly damaged.

Fire and other officials so far have reported detecting calcium carbide, potassium nitrate and sodium nitrate at the site, the AP reported.

Tianjin is a city of about 15 million people in northeast China, about 75 miles east of Beijing.