More explosions have rocked a disaster zone in China (Source AP) New small explosions rocked a disaster zone in the Chinese port of Tianjin on Saturday, as authorities pulled out an additional survivor and began evacuating the area to clean up chemical contamination nearly three days after massive explosions touched off the crisis. Angry relatives of missing firefighters stormed a government news conference to demand any information on their loved ones, who have not been found since a fire and rapid succession of blasts late Wednesday at a warehouse for hazardous chemicals. The death toll in the inferno in a mostly industrial area has climbed to 85, including 21 firefighters — making the disaster the deadliest for Chinese firefighters in more than six decades. An unknown number of firefighters remain missing, and a total of 720 people were injured in the disaster in Tianjin, a key port and petrochemical hub about 120 kilometers (75 miles) east of Beijing. The disaster has raised questions about whether dangerous chemicals were being stored too close to residential compounds, and whether firefighters may have triggered the blasts, possibly because they were unaware the warehouse contained chemicals combustible on contact with water. The massive explosions Wednesday happened about 40 minutes after reports of a fire at the warehouse, and after an initial wave of firefighters arrived and, reportedly, doused some of the area with water.