At least 21 people were killed and 29 others injured after a vehicle lost control due to faulty brakes at a mining company in northern China, authorities said Sunday. The accident occurred around 8:20 am Saturday at a lead, zinc and silver mine under Yinman Mining Company in West Ujimqin Banner, Inner Mongolia Autonomous Region. The regional emergency management department said the vehicle taking the 50 workers to the underground operation lost control due to brake failure and crashed into the side of the tunnel. The injured have been hospitalised. The Ministry of Emergency Management has sent a working team to guide and assist rescue and investigation at the site. Executives of the company have been placed under travel restrictions while the investigation is underway, the ministry said.