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Heavy rain fell Tuesday on the remains of a Chinese industrial site devastated by giant explosions, complicating clean-up efforts and heightening fears about toxic contamination as ceremonies were held to mark the disaster's 114 deaths, AFP reported.
Around 700 tonnes of highly toxic sodium cyanide were at the site in the northern port of Tianjin, officials say, and water could spread it more widely.

Rainwater could also disperse chemical residues on the ground into the air when it evaporates, and some of the many substances on the scene could react with it.

Amid public anger over the disaster more details about the site operator were reported and a senior work safety official was put under investigation.

Officials have insisted the city's air and water are safe, but locals and victims' relatives have voiced scepticism, while international environment group Greenpeace has also urged transparency.

"I'm worried because we don't know what's in the rain," said a taxi driver as he made his way through the morning deluge. "It could be full of poison."