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.
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.
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.