Shortly after the opening, the Dow-Jones index was down 0.5 percent at 32,578. The broader S&P 500 fell 0.6 percent to 4,126 points, while the tech benchmark Nasdaq lost 0.9 percent to 12,607 points.

Apple fell 0.8 percent. According to Japanese business newspaper Nikkei, the iPhone maker has asked its suppliers to comply with Chinese customs requirements regarding deliveries between Taiwan and China. For example, Taiwanese parts must have a “Made in Taiwan, China” or “Chinese Taipei” label.

Tesla fell 1.7 percent. Shareholders of the electric car maker have approved the proposed stock split. In addition, CEO Elon Musk announced that he could announce the arrival of a new gigafactory this year.

Warner Bros. Discovery fell 16 percent after posting a multibillion-dollar loss in the second quarter. The merger between AT&T and the entertainment arm of media giant Discovery Networks will see the company combine its two streaming services, HBO Max and Discovery+, next year.

DoorDash added more than 4 percent. The food delivery service performed better than expected last quarter. The taxi service lifted almost 6 percent, beating market expectations.

Despite weaker figures from meat substitute producers, Beyond Meat won by more than 15 percent. Cinema operator AMC Entertainment posted a slightly higher-than-expected loss last quarter. The company has also announced that it intends to issue additional dividends in the form of preferred shares. Shares fell more than 7 percent.