Toyota Motor Corp. announced on Thursday it will be recalling about 20,000 cars due to possible fuel leaks.

The majority of the vehicles being recalled are in the United States, but some have been shipped to other countries, according to a report from Reuters. Toyota's U.S. department said the recall is on cars equipped with the 2GR-FE motor.

Cars with that motor include the 2015 Lexus RX models, the 2014 Toyota Avalon, 2014 Toyota Camry, 2014 Toyota Highlander and 2014 Toyota Sienna. Lexus is the luxury arm of Toyota.

The problem in the soon-to-be-recalled engines is the possible leakage of a fuel delivery pipe that was not welded properly by a Toyota supplier, the manufacturer said. If the delivery system were to leak, it would increase the risk of a fire.

Toyota said the recall was a precautionary measure and that the company did not know of any fires, crashes or injuries due to the faulty fuel systems.

A Toyota spokesman said that all the Toyota's being recalled were built in U.S. plants and the Lexus models were produced in Canadian factories. Other countries where car owners will be affected by the recall are South Korea, Russia, Australia, and other Asian and Middle Eastern countries.

Once Toyota receives the recalled vehicles, it will inspect the fuel delivery pipes and replace any that are deemed faulty.

To ensure that car owners who may be affected by this recall are informed of the recall, special mail is sent to each owner, according to The Los Angeles Times. The recall information is sealed in an envelope with the words "Safety Recall Notice" in big red letters and is adorned with logos of the Department of Transportation and National Highway Safety Administration.

Regulators say that these envelopes will help prevent car owners from confusing the recall notice with advertisements.