Chinese stocks closed lower on Wednesday, with the benchmark Shanghai Composite Index down 2.4 percent to 3,894.42 points.
The Shenzhen Component Index closed 5.01 percent lower at 13,890.15 points.
The combined turnover of stocks covered by the two indices stood at around 2.5 trillion yuan (about 370.07 billion U.S. dollars), up from 2.4 trillion yuan on the previous trading day.
Bucking the downward trend, shares in coal and banking sectors led the gains, while those in sectors including computing hardware and semiconductor chip were among the top decliners.
China's leading humanoid robot maker Unitree Robotics, the first humanoid robot maker listed on the A-share market, made its debut on the Shanghai STAR Market Wednesday. Its shares opened 629.44 percent higher and ended the day up 460.34 percent, with turnover reaching 23.16 billion yuan.
The ChiNext Index, tracking China's Nasdaq-style board of growth enterprises, lost 6.26 percent to close at 3,473.49 points Wednesday.
The STAR Composite Index, which reflects the performance of stocks on China's sci-tech innovation board, closed 7.16 percent lower at 1,954.02 points on Wednesday.
Chinese shares close lower Wednesday
The U.S. National Highway Traffic Safety Administration (NHTSA) has opened an investigation into Tesla's certification that its new Cybercab meets all applicable Federal Motor Vehicle Safety Standards (FMVSS).
The probe, formally designated as an Audit Query, was opened on Sept. 3 and covers an estimated 1,000 Cybercab vehicles, according to an NHTSA investigation document made public on Friday. It will examine the process and technical data Tesla relied upon when certifying the Cybercab, as well as related issues. Tesla began commercial deployment of a small number of Cybercab vehicles in Austin, Texas, on Thursday and notified the agency that it had certified the vehicles as compliant with all applicable FMVSS. Tesla also told the NHTSA that it plans to gradually expand commercial deployment of the Cybercab to include additional vehicles and locations.
The vehicles lack permanently attached conventional manual controls, such as a brake pedal, gas pedal, steering wheel and mirrors, according to the NHTSA.
The agency said the inquiry will examine, among other issues, the extent to which Tesla's certification depended on determinations that certain FMVSS are inapplicable to the Cybercab.
In the United States, the NHTSA establishes vehicle performance requirements, while automakers must certify that their vehicles meet applicable standards before entering the U.S. market, subject to agency oversight to confirm compliance. The NHTSA said it conducts investigations when certified vehicles appear not to adhere to those requirements.
U.S. regulator opens probe into Tesla Cybercab self-certification
