The president of the company's US operations admitted in testimony before Congress last month that Toyota's recall may not completely solve problems of sudden unintended acceleration.

丰田美国负责人在上月国会举行的听证会上曾经承认，回召不一定能够完全解决丰田车意外突然加速问题。

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In a statement, Toyota said it had received a Securities and Exchange Commission request and a federal grand jury subpoena for documents related to the sudden unintended acceleration.

并且，在一份报告中，丰田表示，它已收到来自某证券交易委员会的书面请求，以及某联邦大陪审团的传票，均要求丰田提交对突然意外加速问题的相关文件。

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The CNN Fact Check Desk wondered: Which other car manufacturers have had a problem with sudden unintended acceleration?

CNN: Fact Check: Toyota not alone in acceleration problems

There are numerous references to so-called "Books of Knowledge, " highly confidential information on design, safety systems and testing records allegedly generated by Toyota engineers on everything from roll-overs and roof safety to sudden unintended acceleration.

CNN: STORY HIGHLIGHTS

As the company's woes continue to mount, there has been some speculation from critics such as Rep. Henry Waxman, D-California, as to whether Toyota's recent problems with sudden unintended acceleration go beyond the problems already identified.

CNN: Fact Check: Toyota not alone in acceleration problems