Officials in Shigatse in the Tibet autonomous region vowed to carry out an investigation on Sunday after the outdoor apparel brand Arc’teryx worked with Chinese artist Cai Guo-qiang to set off fireworks at the foot of the Himalayas in a publicity stunt. “We have immediately sent an investigation team to the site and will take actions according to laws and regulations,” the officials said in a statement. Arc’teryx later apologised on Weibo, saying it would invite professional environmental groups...