Media playback is unsupported on your device Media caption The BBC's Jo Floto: "The chemical warehouse, which is the centre of this disaster, is only 500 metres away from a massive residential complex."

People in the Chinese city of Tianjin whose homes were damaged by the huge explosions on 12 August have staged protests to demand compensation from the government.

Scores gathered outside the Mayfair Hotel, where officials have been giving news conferences.

Residents say the chemical storage warehouses which blew up had been built illegally close to their homes.

The blasts focused on a warehouse which was storing sodium cyanide.

Tianjin - the toll

Officials now say 114 people died in the explosions

Still missing: 70, mostly firefighters

Nearly 700 are still in hospital

At least 6,000 people have been displaced, state media report

Some 17,000 homes damaged by the blasts and their shockwaves

An investigation into the cause of the explosions is under way.

The warehouse was storing hundreds of tonnes of sodium cyanide, far more than legally allowed. It was was also within 500m (1,640ft) of homes, flouting laws which state a 1km minimum distance.

Local media had earlier reported that there were at least three residential complexes within 1km of the warehouse, which belonged to Ruihai International Logistics.

In the latest in a number of small protests, the people gathered at the Mayfair Hotel on Monday said they wanted compensation for their damaged homes, and would refuse to return to them even if they were ruled safe.

"We don't know if there will be further leaks in the future. We could be living near a ticking time bomb," one resident, who gave his name as Chen, told reporters.

In an open letter to the authorities, the residents said their groundwater could have been contaminated, and that logistics companies and chemical "dumping grounds" remained close to residential complexes.

"Our neighbours lost their lives there. Their screams can never be erased for a long time. How can we live in that 'execution ground' with any peace of mind?" the letter states.

What is sodium cyanide?

Image copyright Reuters

The chemical sodium cyanide is white crystalline or granular powder which can be rapidly fatal if inhaled or ingested, as it interferes with the body's ability to use oxygen.

It is mostly used in chemical manufacturing, for fumigation and in the mining industry to extract gold and silver.

It is soluble in water, and absorbs water from air. Its dust is also easy to inhale. When dissolved or burned, it releases the highly poisonous gas hydrogen cyanide.

Potent chemical mix behind blasts

What we know about explosions

The questions being asked by Chinese citizens

'Hero' firefighters hailed

'Like the end of the world': Residents' stories

Public demonstrations remain rare in China, but authorities have allowed some criticism on the highly-publicised Tianjin incident, with even state media taking issue with local authorities' handling of the matter.

The BBC's Jo Floto, in Beijing, says it is clear that many of the rules designed to keep people safe in Tianjin were bent, broken or ignored.

There have also been real questions about the leadership and training of the firefighters who arrived first on the scene on Wednesday, he adds - all but a handful are missing or dead.

Deputy mayor He Shushan promised: "Once we find any actions that have violated the regulations and laws, we will resolutely punish them and give answers to the victims and people affected."

The protests come amid continuing uncertainty about the wider environmental impact of the explosion, although state media have sought to tamp down rumours of widespread contamination.

Authorities are still cleaning up the site and putting out the fire at one last active burning point.

Officials said on Monday that three waste water discharge monitoring stations within the 3km-radius evacuated area around the blast zone found excessive levels of cyanide, with one station recording a level 27.4 times the normal limit, reported People's Daily.

But authorities have stressed that the area is sealed off and hazardous material was contained at the site, and that all the sodium cyanide would be collected and neutralised by the day's end.

They also said only one air quality monitoring station had detected a minimally higher level of hydrogen cyanide.