Apple shares took a negative impact on strength of a report claiming some documents relating to its stock options grants were faked.

It appears the investigation into the problem revealed some forged documentation, and that the existence of such documents has raised the attention of US regulators.

The report first appeared on this weekend. First published by The Recorder, it also claims Apple CEO Steve Jobs has hired his own external attorney to deal with inquiries by the Securities and Exchange Commission and the US Department of Justice.

In October, Apple revealed that Jobs had been aware that some stock options grants had been backdated, but that he had not profited from these and had been unaware of the implications of the actions.

The Recorder's report cites anonymous sources.