Wheldon, 33, died after suffering "unsurvivable injuries" in a 15-car pile-up on lap 11 of Sunday's Indy 300 at Las Vegas Motor Speedway and several high-profile figures in motor racing have since come forward to criticise the safety of the series.
And IndyCar Series have revealed that the Automobile Competition Committee of the United States (ACCUS) and the world governing body will help them look into the factors that led to Wheldon's death, although it could be several weeks before any findings are released.
"The safety of our drivers, their crews, IndyCar staff, racetrack staff and spectators is always our paramount concern," read a statement from the IndyCar series orgnaisers, quoted on autosport.com.
"As part of our standard safety protocol, a full investigation has been launched by IndyCar, with assistance from the Automobile Competition Committee of the United States (ACCUS) and Federation Internationale de l'Automobile (FIA), the national and international governing organisation, to determine the factors involved in this accident.
"We hope to have preliminary findings to report within the next several weeks. In the meantime, it would be inappropriate to comment further until the investigative team has had the opportunity to conclude its work."