Chinese Premier Li Keqiang visited Tianjin yesterday days after explosions killed at least 114 and flattened part of a national development zone, state media reported.
He toured the site of the blasts to oversee the search and rescue operation and stressed the importance of monitoring the quality of the air, water and soil in the area.
Later Li paid his respects to the fire fighters who lost their lives during the rescue operation, CCTV said. At least 39 fire fighters were killed, according to state media.
It is estimated 70 people, most of them fire fighters, are missing and 700 people remain in hospital, state media said.
The death toll following the explosions in Tianjin has risen to 114, Chinese state media reports.
Reporting on a news conference with the vice mayor of Tianjin, He Shushan, the news agency said that 70 people are still missing following the blasts.
Chinese officials have acknowledged the presence of toxins at the site of two massive explosions in a warehouse district in the city of Tianjin, but said they pose no risk to people outside the two-km evacuation zone.
"I can responsibly say that there will be no secondary damage to the people," Shi Luze, the chief of staff of the People's Liberation Army's Beijing Military Region, told reporters, referring to people outside the zone.
Mr Shi confirmed the presence of more than 100 tons of deadly sodium cyanide, stored at two separate sites.
He said workers were trying to clear the area of chemicals before possible rain showers, which could create toxic gas.
The death toll from the massive explosions in Tianjin has risen to 112 with 95 still reported missing, China's Xinhua news agency reported.
Eighty-five of those unaccounted for after Wednesday's blasts in the Chinese port city are firefighters.
Residents who had taken refuge in a school near the site of the explosions were evacuated yesterday after a change in wind direction prompted fears that toxic chemical particles could be blown inland.
The death toll from two massive explosions that tore through an industrial area in the port city of Tianjin in northeastern China has risen to 104, according to Chinese state media.
The number of people killed had previously been put at 85.
An unspecified number of people have been evacuated from near the location of Wednesday's blasts after a fire broke out again at the site.
Many took refuge in a school near the site, state media said, but the have been moved again after a change in wind direction on Saturday prompted fears toxic chemical particles could be blown inland.
China has issued a warning of harmful toxic substances surrounding the Tianjin blast site after a change in wind direction.
Residents have been told to wear long trousers and masks as they evacuate schools initially used as safe-havens after Wednesday night's two huge warehouse explosions.
Local police have for the first time confirmed deadly sodium cyanide has been found at the site in the northeastern port city.
Armed police have evacuated people within three kilometres of the Tianjin explosion site after fresh blasts were heard on Saturday morning.
A number of cars were seen ablaze and at least three places were on fire, with thick black smoke rising from the scene after a number of explosions were heard.
Cyanide was also reportedly found by investigators.
Furious residents and victims' relatives railed against authorities outside a news conference on Saturday for keeping them in the dark as criticism over transparency mounted.
Eighty-five people are now thought to have died following two huge explosions in a warehouse area storing dangerous in the Chinese city of Tianjin.
The country's Xinhua News Agency reported the revised figure more than 48 hours after the blasts, which sent shockwaves across the port city.
Many firefighters were feared to be among the dead.
A firefighter has been pulled alive from the rubble in the Chinese city of Tianjin nearly two days after a series of explosions which killed at least 50 people.
Zhou Ti, 19, is being treated for chest injuries and is in a stable condition in hospital, the city's government said.
He was one of more than 1,000 firefighters sent to the burning hazardous goods storage facility. The explosions that followed killed 17 of his colleagues.
Candlelight vigils have been held across China for the victims of the Tianjin explosions.
Candles were placed in the shape of hearts and Chinese words such as "Tanguu, be safe". Tanguu is the former name for the port of Tianjin.
56 people are now reported to have died, including 21 firefighters.