Kia EV6 GT / Courtesy of Kia

Hyundai Motor and Kia saw their electric vehicle (EV) sales in the United States sink in September from a month earlier amid worries over the potential impact from a new U.S. law disadvantaging EV makers that do not produce the green vehicles in America, company data showed Tuesday.

According to Hyundai Motor America, the U.S. sales unit of the Korean automotive group, it sold 1,306 IONIQ 5 EVs last month, down 14 percent from 1,517 sold in August.

Its smaller affiliate, Kia, sold 1,440 units of the EV6 model, shrinking 22 percent from the August sale of 1,840 vehicles.

The July sales of the IONIQ 5 and the EV6 came to 1,984 and 1,716 units, respectively.