Chinese police have arrested 12 people suspected of involvement in this month’s massive explosions at the city of Tianjin.<br /><br /> Among them are the chairman and vice chairman of the company that had been storing the chemicals that blew up.<br /><br /> At least 139 people were killed in the blasts that devastated the port.<br /><br /> The news comes a day after China sacked the head of its work safety regulator for suspected corruption.
