Twelve people suspected of being involved in the massive explosions at a chemical storage warehouse in Tianjin, China, have been arrested.
According to local media, they included the chairman, vice-chairman and three deputy general managers of the logistics company which had been storing the volatile chemicals.
The blasts killed 139 people and injured hundreds more, leaving the port area of the city in ruins.
Hundreds of Tianjin residents, whose homes were destroyed in the explosions, held a protest outside a news conference today.
Holding banners reading 'Give back our homes' marched to a hotel where a news conference was to take place demanding answers from the government.
Nearly 700 people remained in hospital four days after Wednesday's disaster, which damaged buildings and shattered windows of nearby apartments.
Some 6,300 people have been displaced by the blasts.
Thousands of dead fish have washed up near the site of two explosions which killed at least 114 people in China.
China's authorities face increasing pressure for answers and assistance from citizens left homeless after the devastating factory explosion.