By Joseph White
DETROIT, July 11 (Reuters) - The U.S. Securities and Exchange Commission is investigating whether Tesla Motors Inc waited too long to disclose a fatal crash in May that called into question the safety of a system in the car that takes control of steering and braking, the Wall Street Journal reported on Monday, citing an unnamed source.
Tesla said in a statement on Monday afternoon that it "has not received any communication from the SEC regarding this issue." The SEC declined to comment.
Tesla shares fell 1.3 percent in after-hours trading following the publication of the report on the Journal's website.
The stock had risen 3.7 percent during regular trading, following a tweet on Sunday by Chief Executive Elon Musk that he is working on a "Top Secret Masterplan, Part 2" for the electric car company.
Musk, hinting at a possible new vision for the company, stated in the tweet that he hoped to "publish later this week."
In its report on Monday, the Journal said the SEC is scrutinizing whether Tesla should have disclosed the fatal accident involving a Model S sedan operating in Autopilot mode as a "material" event, or a development a reasonable investor would consider important.
It is unclear what action, if any, the SEC will take. Automakers do not customarily report fatal auto accidents involving their vehicles as material events to shareholders. There is no established practice yet for reporting accidents where emerging auto-driving technology may be a factor.
The U.S. National Highway Traffic Safety Administration (NHTSA) already said that it was investigating the May 7 accident in Florida, in which 40-year-old Joshua Brown was killed.
NHTSA is sending a five-person team to Florida later this week to investigate that crash, said Christopher O'Neil, a spokesman for the agency, which makes recommendations to regulators and companies about transportation-related safety issues.
The timing of Tesla's disclosures about the accident has become an issue for the company in part because Autopilot is key to its image as a pioneer in automotive technology. No other automaker has released to the public a system in which a person can drive with hands off the wheel for an extended period while a car is in motion.
Tesla has said Autopilot should be used as a backup and not as a replacement for the driver, who should keep hands on the wheel all the time, and it has cautioned that the system is in beta, or test, mode.
Musk last week used his Twitter account to mount a defense of Tesla's decision not to disclose the accident to the public until June 30, when NHTSA said it was launching its investigation.