Published: Oct 28, 2010 7:49 PM EDT
Updated: Oct 28, 2010 4:49 PM EDT

LOS ANGELES (AP) - New court documents filed in a case against Toyota Motor Corp. claim the auto giant bought back cars with sudden acceleration defects and failed to report the problem to federal regulators.

The allegations made in court documents filed Wednesday also say Toyota compelled car owners to sign confidentiality agreements that prevented them from speaking publicly about sudden acceleration in their vehicles.

An e-mail message for a Toyota spokesman was not immediately returned.

Hundreds of lawsuits were filed against Toyota after the automaker began recalling millions of vehicles because of acceleration problems in several models and brake glitches with the Prius hybrid.

All of the federal cases were consolidated and assigned to a judge in Southern California.